This structured plan takes you from "rusty" to "case-ready" in two weeks. Whether you're cramming before interviews or warming up for intensive prep, follow this day-by-day guide.
Who This Plan Is For
Last-minute prep (2-3 weeks out):
Follow this plan, then do 1-2 days of full case practice.
Warm-up (4+ weeks out):
Use this to build your foundation, then continue with case practice.
Maintenance (post-interview):
Return to this plan between rounds.
How to Use Case Math Practice
For each day:
- Mental Math Sprint — Use specified difficulty
- Case Math Drills — Use specified topic
- Target time — Don't exceed daily time (avoid burnout)
Day-by-Day Schedule
| Day | Focus | Mode | Duration |
|---|---|---|---|
| 1 | Baseline test | Mental Math (Medium) | 15 min |
| 2 | Percentages | Mental Math (Easy) + Drills | 20 min |
| 3 | Multiplication | Mental Math (Easy) | 15 min |
| 4 | Division | Mental Math (Easy) | 15 min |
| 5 | Mixed easy | Mental Math (Easy) | 20 min |
| 6 | Review weak areas | Mental Math (Easy) | 15 min |
| 7 | Rest | — | — |
| 8 | Step up: Medium | Mental Math (Medium) | 20 min |
| 9 | Profitability | Case Math Drills | 25 min |
| 10 | Growth & CAGR | Case Math Drills | 25 min |
| 11 | Mixed medium | Mental Math (Medium) | 20 min |
| 12 | ROI & Breakeven | Case Math Drills | 25 min |
| 13 | Full speed test | Mental Math (Medium) | 20 min |
| 14 | Final review | Mental Math (Hard) | 20 min |
Total: ~4 hours over 2 weeks
Detailed Day Instructions
Day 1: Baseline Test
Complete 2 Mental Math Sprints (Medium). Record:
- Questions answered
- Accuracy %
- Types you struggled with
This is your starting point. You'll compare against it on Day 14.
Days 2-6: Foundation Building
Focus on accuracy over speed. If you're getting <80% accuracy, slow down.
Common issues to address:
- Percentage conversions (25% = 1/4)
- Two-digit multiplication
- Division with remainders
Day 7: Rest
Your brain consolidates learning during rest. Don't skip this.
Days 8-14: Building Speed & Complexity
Now push for speed while maintaining >90% accuracy.
Add business context with Case Math Drills. Practice the formulas you'll actually use.
How to Measure Progress
Track these metrics:
| Metric | Day 1 Target | Day 14 Target |
|---|---|---|
| Questions/sprint | 8-10 | 15+ |
| Accuracy | 70%+ | 90%+ |
| Confidence | Hesitant | Automatic |
What to Do After 14 Days
If interviews are soon:
- Continue 1 sprint daily (maintenance)
- Focus on full case practice
- Review weak formulas morning-of
If interviews are later:
- Drop to 3 sprints per week
- Mix in Case Math Drills
- Ramp back up 1-2 weeks before interviews
Sample Day Walkthrough
Day 9 Example (Profitability Focus):
| Time | Activity |
|---|---|
| 0-5 min | Mental Math Sprint warmup (Easy) |
| 5-15 min | Case Math Drills — Profitability topic |
| 15-20 min | Review explanations for wrong answers |
| 20-25 min | Mental Math Sprint (Medium) |
Key Success Factors
- Consistency > intensity: 15 min/day beats 2 hours once
- Track progress: Numbers motivate
- Review mistakes: Don't just do problems, learn from errors
- Rest properly: Day 7 matters
- Don't skip the hard stuff: If percentages are weak, do more percentages
Start Now
Begin Day 1 → Mental Math Sprint (Medium)
14 days from now, you'll be glad you started today.