This review will just go through the first mini-case interview. As someone who is generally pretty confident in their math skills, I was pretty disappointed with how I performed. This was my first time doing a case interview and I only had one day to prepare so I had to wing it for the most part. In hindsight, the math was quite easy but you may still struggle due to the novel structure of cases (if you are new to them) and the need to manage the simultaneous back and forth communication with the interviewer. The nature of the case (at least for me, an independent worker) made it harder to focus and unfortunately introduces the pressure of having the interviewer watching over you. To help those who are new to cases, or don't have a lot of time to prepare, I'll outline what I would do differently to ace the case If I had another opportunity. 1. Keep one sheet of paper for all the initial variables that interviewer provides, revenue sources, costs etc. You will be referring to this quite often during later calculations and want to be able to reference it easily. A separate sheet can be used for calculations. 2. I would recommend converting all units to a common unit (i.e. weeks to months to years, USD to CAD, miles to KM etc.) upfront so you can avoid repetitive calculations later on. Confirm with the interviewer, if you have any doubts on what units the end solution will be in . 3. Take a minute or two to understand the initial case details. Try to relax, and take your time, if you misinterpret something, it could really hurt you later on. 4. Use shorthand notations when creating notes, i.e. VC for variable costs, FC fixed costs, /year, /day etc. It will save you a lot of time and might reduce the need to ask interviewer to repeat themselves. 5. Ask questions. If you're like me you would probably prefer receiving written case details as there is less room for misinterpretation, and less chance to miss out an important detail the interviewer has mentioned. Unfortunately, details of the case will be delivered verbally and there can be a LOT of details. clarify EVERYTHING: numbers, fixed vs. variable, units. After receiving the information I'd go down the list and confirm all the details with the interviewer just to make sure. Overall, the most important thing is to stay organized and stay relaxed. Create a structured framework beforehand and follow that structure during the interview. Being nervous or stressed could lead to making silly mistakes, don't feel pressured to get an answer right away, ask for time to think about the problem so the interviewer doesn't feel like your unengaging.