A 4-week case interview prep plan, day by day

A four-week case interview preparation plan: what to do each day, how many cases, when to drill maths and fit, and how to know you are ready. 7 min readUpdated 12 November 2026By the Prepper team

Four weeks is enough to prepare for a consulting case interview if you work about 90 minutes a day and spend that time practising, not reading. If you have longer, use the 8-week plan. This plan assumes around 25 cases and daily drills.

The plan

Week	Goal	Daily work (about 90 minutes)
1	Learn how a case runs	1 case every other day, 15 minutes of case maths daily, read the framework guides
2	Build the single skills	1 case a day, plus one drill: structure, charts or market sizing
3	Cases with a partner	1 partner case a day, record yourself, start fit stories
4	Interview conditions	Full mocks, online test practice, fit stories out loud, rest the day before

Week 1: how a case runs

Do the consulting sampler on day one to see where you stand.
Read how a case interview works and case interview frameworks.
Start a mistake log: one line for every error, and the rule that would have prevented it.

Week 2: the single skills

Cases are made of five skills. Drill each on its own, because ten minutes on one skill teaches more than one more full case.

Skill	Drill
Structuring	Structuring drill
Case maths	Case math trainer
Exhibits	Chart and exhibit reading
Market sizing	Market sizing drill
Brainstorming and synthesis	Brainstorming and synthesis

Week 3: with a partner

Cases done out loud with another person are worth twice as much as cases done alone. Give cases as well as take them: watching someone else's mistakes is the fastest way to see your own. Draft five fit stories this week and say them aloud.

Week 4: interview conditions

Two full mocks with someone who has done real interviews, if you can find one.
Any online test your firm uses, at test length.
Fit answers at two minutes each.
No new material in the last two days.

How to know you are ready

Your structure for a new case takes under two minutes and is specific to the case.
You make at most one maths slip per case, and you catch it yourself.
Your recommendation takes under a minute and starts with the answer.
A partner can follow your reasoning without asking you to repeat it.

Frequently asked questions

Is four weeks enough to prepare for a case interview?
For most candidates yes, at about 90 minutes a day and 25 or so cases, with daily drills on maths and structure.
How many cases should I do before a consulting interview?
Most successful candidates do 25 to 40. Quality matters more than the count: review every case and log the mistakes.
Should I practise cases alone or with a partner?
Both. Use solo drills for maths, charts and structure, and partner cases for communication and pacing.

Is four weeks enough to prepare for a case interview?

For most candidates yes, at about 90 minutes a day and 25 or so cases, with daily drills on maths and structure.

How many cases should I do before a consulting interview?

Most successful candidates do 25 to 40. Quality matters more than the count: review every case and log the mistakes.

Should I practise cases alone or with a partner?

Both. Use solo drills for maths, charts and structure, and partner cases for communication and pacing.