I wish I would’ve chosen to start my GMAT practice with Christian before. I used several online resources and group studying and these tools didn’t allow me to achieve the score I required. However, I reached out to Christian to have private classes in an intense 1- month push in order to give my score a boost, after that month the results were amazing!

Christian was not only a teacher for me, but a mentor too. He has the best hacks and tips to approach the GMAT but also invested time in helping me to strengthen my self-confidence through advice and lots of patience.
I highly recommend his online course to set the bases and the private classes to really take the results to a next level.


When I began this journey I felt very unsure of myself. I had never been good at math, I hadn't done any complex math in over 7 years, and my first GMAT simulation had resulted in a crushing Quant score of 32...

However, Christian knew exactly what to do. He layed out a rigorous -but reasonable- plan of attack, and in only 2 months I was scoring 46's and 47's in my simulations.

His online platform is an extremely powerful tool, with brilliant tutorials that allow you to study -and learn- on your own time; his deep knowledge of the theory and all the little tricks make math easier and even enjoyable!

But, more importantly, Christian is someone who truly cares about his students and wants them to succeed. He motivated me and believed in me, even when I felt like giving up.
When I began this journey I thought I was hiring a tutor. Instead, I ended up finding a mentor and a friend. Thank you Christian!!


Christian helped me raise my quant score to be able to obtain a 700 in just one month. The online platform truly helped to internalize his way of solving problems fast and accurately. While taking the mock tests, I always asked myself: "what would Christian do?"

I know that if I had met Christian before I would have obtained 700 in one third the time, at least. His methods and strategies are not the typical ones taught in books, as the classes are truly personalized, which guarantees fast improvement. Totally recommended!


At the beginning, I had my doubts about taking recorded online lessons, but my experience with Christian's platform totally changed my mind. The platform is great, Christian has the ability to impart knowledge and the famous tricks to others through recorded lessons. Also, you can go at your own pace and when you need to delve into a topic, taking classes with him take your knowledge to another level.

I found in Christian not only the best math teacher for the gmat, but also someone who helped me and gave me guidance in this whole process and a friend.

If you are reading this, do not hesitate and reach him.

elias castro // the tuck school of business

Select Dynamic field

Before taking Christian's course, I have been studying by myself for more than a year and I could only achieve a Q45 (on a good day). After taking the course, in only 1 month I managed to get Q48 in my official exam and reached my goal of 720. I recommend Christian's course 100% and I wish I had contacted him sooner.


When I started working with Christian I was already doing well in mocks, but it wasn't reflecting on my official tests. With the classes I quickly realized that there were things that I didn't know I was missing in my preparation. I put in the hard work, but this time it was the RIGHT hard work.

I used the online platform to binge learn most of the tricks and new strategies in a couple of weeks while balancing one on one classes and a demanding job schedule.

Finally in just one month I was able to land a solid 49 in quant, and I truly believe that Christian's help and expertise was an important factor in achieving this result. I highly recommend him!

FIORELLA JUSCAMAITA // haas school of business

Christian is an excellent teacher, not only because he is an expert in GMAT Quant, but also because he really cares for his students and is always available and willing to help. His online platform was very useful to learn the theory and main techniques in a clear and structured way, and at my own pace. Then, during one-on-one classes Christian helped me to gain speed and confidence, by teaching me good tricks, short-cuts and simple approaches to solve questions faster. Most importantly, Christian was very understanding during the whole GMAT process; he shared lots of material to practice and gave me excellent advice and guidance along the way. I highly recommend him!

ADRIANA ARNILLAS // Business Analyst at McKinsey & Company

What makes Christian different (and great) is that he makes an effort to understand where you are struggling, which topics are your strength, and how you can improve. Through his teaching method, I raised my quant score from Q44 to Q49. If you are aiming for a top MBA program, I suggest you reach out to Christian.

alejandro couttolenc // columbia business school

Christian really helped me understand Probabilities and Ratios, my two weakest topics in math. He gave me good tricks to tackle these problems and lose the fear. Plus, he was very understanding during the whole Gmat experience and always supported me with additional material to study and helped me when I had any particular doubts with math problems.


Taking intensive classes with Christian, I was able to increase my quant score from 30 to 49 in two months! His methods and strategies really worked and helped me to master complicated subjects fast. I would recommend him to anyone who wants to score very high on GMAT quant.


Like for many people, the GMAT was a real challenge for me. In order to succeed in quant you don't only need to be dedicated and hard working, but you also need to dominate the techniques, tricks, and strategies to tackle every topic in the exam. All of that is taught by Christian in a very easy, simple, and efficient way. I recommend him 100%, he's a math expert and great teacher.

JOSE PARDO // darden school of business

The classes with Christian have been very helpful to understand all the topics and increase my level in math. Christian is an expert in math and he can even explain the hardest topics with a method that is simple to understand.

flavia bueno // babson graduate school

Christian was incredibly helpful in strengthening my quant skills for the GMAT. Not only is he a brilliant teacher that works restlessly to break down concepts making them easily digestible for his students, he also gives valuable strategic recommendations that allow you to better approach the overall test. I highly recommend MBA Prep Tutoring to anyone interested in applying to a top 10 MBA program.

gonzalo de cardenas // kellogg school of management

Working with Christian was a real pleasure. Since day 1 it was easy to tell he had all the knowledge and necessary tools to help you get the desired score. He had a thoughful approach for the whole proces and offered guidance in many aspects along the way (besides just math). 100% recommended!

salvador carrillo // columbia business school

Before I started working with Christian I believed that I was prepared and only needed to correct some specific aspects. But I couldn't be more wrong. The method on how to approach each specific problem and how to apply the theory were the steps that I was missing. 

ignacio molina

My first contact with GMAT Quant preparation was through Christian’s online classes and 1o1 lessons.

Through the online classes, I felt very comfortable with this teaching method: structured topics and lots of exercises with clear explanations and helpful tips (which I think make the difference between solving a Quant problem correctly vs doing it in an optimum range of time). As I progress through the course I was able to notice how I was improving, and how know-how from previous lessons was helping me with further topics. Through his 1o1 lessons, I was able to polish how I solve and approach the different types of exercises. He focused on exactly which was my procedure and how I could optimize it to reduce the time I took to solve each exercise.

I definitely recommend Christian. The structure of his course, the clarity of his explanations (both through videos and 1o1 classes), and his accessibility to ask questions and support are key differentiators to his MBA Prep Tutoring course, and helped me reach a score of 49 in Quant section.

VANESSA ABUNDIS // Chicago booth

Select Dynamic field

I was referred to Christian by a friend, and booked a meeting with him on the same day after being impressed by his website. I was pleasantly surprised by his availability and encouragement after I shared my initial results. During our one-on-one sessions he was able to identify my weaknesses. I believe this was a changing point in my GMAT prep since I gained consciousness of small mistakes and time-consuming tasks that were very specific to me and that I needed to avoid. When I saw my quant results I contacted him immediately to thank him. I recommend contacting Chirstian for guidance. It was truly one of the best decisions I made in my GMAT prep.

melisa ynga

Christian was a great support during my preparation for the GMAT exam, not only for his methodology but also for the motivation and confidence that he gave me throughout the process. His methodology and his platform are 100% recommended, the videos are very easy to understand and you can quickly solve high-level problems in a more orderly and simple way. Also, he manages to provide you with the precise techniques and strategies that are needed to be able to optimize your time during the exam. I strongly recommend him as a Quant teacher. 

andrea pimentel // frankfurt school of finance and management

I had tried many math courses to prep for the GRE Quant section before finding Christian.  Taking classes with him was the best decision I ever made!

With his teaching method, I was able to detect tricks and techniques to answer the test. He has all the necessary tools to make studying easy and not overwhelming.  While he teaches, he patiently explains each subject with exercises and examples.

Something that I always appreciated was his encouragement to practice every day.  He is an excellent math teacher and kindly understands when math is not your strongest subject. Thanks to his excellent teaching method, I was able to feel confident to reach a higher score on the Quant section. 

paulina bustos // MPA-DP Columbia University:SIPA

Christian has various formulas that will help you approach the GMAT in a better way. For me, the GMAT, especially the quant section has been my Achilles heel. I have been studying with Christian's virtual classes and zoom meetings and they have helped a lot. I was be able to get the score that I needed. Thank you, Christian

heidy sosa // degroote school of business

Christian really helped me improve my quant score, his videos make complex topics very easy to understand and one to one classes with him were great!