Use the two cases for different purposes. Make one a realistic simulation under interview conditions and use the other to target the weakness most likely to cost you points.

After each case, spend more time on the mistakes than on squeezing in another full case. Two deliberate cases can be more useful than five random ones.

The final day should be lighter. Review patterns, not every framework you have ever learned. If useful, this guide on first-round consulting interviews gives more detail.

one sim + one weakness case is exactly what I'd do.