Part of the studying is learning how to learn. It's not just the studying of the facts, it's refreshing them that is the key. It's rather like being a spy in a foreign country
- it's not enough just to assume a new identity, you have to live the part and that means getting information into long term memory and making it stick there. Making notes is a major part of the process, as is not overdoing it. A sure sign that things are wrong is the last minute cramming just before going into the exam.
We also recommend doing the consolidation earlier rather than later.
Each school has its own order of study, and you should probably stick to that from yours, but for the curious, if you cannot take all the exams at once (also recommended), this grouping covers much of the crossover:
Module 1
Human Performance
Airframes & Systems
POF
Systems
Engines
Instruments*
Module 2
Law
Ops
Performance
Mass & Balance
Radio Nav
Communications
Module 3
Navigation
Meteorology
Flight planning
*Maybe take the exam with navigation, because Inertial Navigation is misplaced in this subject and requires some knowledge of lat & long. Less of a problem if you have a PPL and have been properly taught