Hey! hope you're doing well and keeping safe.

I found myself in a similar situation - I was fairly strong at math having aced all math courses in college/university but for some reason I seemed to struggle with case math. Here are some tips that worked for me:

- Case math, conceptually, is rather basic. Its arithmetic after all, however the arithmetic difficulty is dialed to 11! You're dealing with large numbers (millions and billions) AND you need to be quick! I would recommend using the math tool on victor cheng's case interview website and practicing daily to deal with large numbers and to get better at both estimaton and exact answers

-Practice in front of a friend/family member! I can't stress this enough. Doing math on your own vs doing it infront of somebody sitting across and staring at you is a different ball game. Create an interview like environment and practice the quant with somebody sat across from you. This will help greatly with confidence. Walk your interviewer through your formula, reason for using the formula (logic) and then involve them in the calculation. Explain any assumptions. Basically get more comfortable communicating.your thought process.

Some other minor but helpful tips

-memorize your squares and cubes

-practice extensively with fractions, percentages (YouTube videos for shortcuts and drills)

Learn inverse numbers for e.g 1/6,2/6,3/6,4/6 1/7,2/7....1/8, for upto 11 - this will help improve your speed in mental math and consequently help you feel confident not to mention save time.

For finding the driving factors in any case my advice would be to follow up any WHY question with a HOW MUCH question. So try and quantify any information you get and get to a level, by practice ofc, where you are constantly switching b/w qualitative and quantitative analysis and supporting one with the other. Practice as many live cases as you can.

This is what worked for me, I am sure the experts would have much better advice. Hope this helps!

Hey! hope you're doing well and keeping safe.

I found myself in a similar situation - I was fairly strong at math having aced all math courses in college/university but for some reason I seemed to struggle with case math. Here are some tips that worked for me:

- Case math, conceptually, is rather basic. Its arithmetic after all, however the arithmetic difficulty is dialed to 11! You're dealing with large numbers (millions and billions) AND you need to be quick! I would recommend using the math tool on victor cheng's case interview website and practicing daily to deal with large numbers and to get better at both estimaton and exact answers

-Practice in front of a friend/family member! I can't stress this enough. Doing math on your own vs doing it infront of somebody sitting across and staring at you is a different ball game. Create an interview like environment and practice the quant with somebody sat across from you. This will help greatly with confidence. Walk your interviewer through your formula, reason for using the formula (logic) and then involve them in the calculation. Explain any assumptions. Basically get more comfortable communicating.your thought process.

Some other minor but helpful tips

-memorize your squares and cubes

-practice extensively with fractions, percentages (YouTube videos for shortcuts and drills)

Learn inverse numbers for e.g 1/6,2/6,3/6,4/6 1/7,2/7....1/8, for upto 11 - this will help improve your speed in mental math and consequently help you feel confident not to mention save time.

For finding the driving factors in any case my advice would be to follow up any WHY question with a HOW MUCH question. So try and quantify any information you get and get to a level, by practice ofc, where you are constantly switching b/w qualitative and quantitative analysis and supporting one with the other. Practice as many live cases as you can.

This is what worked for me, I am sure the experts would have much better advice. Hope this helps!