I was a university student and was able to crack all the exams out of the way in about 5 weeks. Some I had to spend more time on (AGK, NAV) and some I was able to study for and revise over a couple of days (HF, FP+P, RT). My Air Law and Met had expired because I completed them earlier in my training, however as I had already looked over the material, it was easier to absorb the second time around.