So the key ways to overcome these issues are:
1. P - Plan and prepare early, no last minute work (plan your study strategy & practice, practice, practice!)
2. S - Seek to understand, not to rote learn (esp for Math & Science subjects)
3. L - Learn to management your work and time (most PSLE students have time management issues)
4. E - Excel in your subjects, dont be complacent
(For example, if you are good in Math, excel in it and don't be complacent. You would have more time to study for other subjects)