Start early.
Inevitably you will get distracted with demands from work, family and life. Slacking off can also be an issue. Give yourself some margin of error by starting early.
Most will tell you that mock exams are key. I didn’t spend that much time on mock exams – rather I mostly spent my time going over the material – again and again. When I did finally get to mock exams, I didn’t bother with taking timed mock exams – I would just read over the practice questions and then go directly to the answer. Most of the time I wouldn’t even bother with attempting to answer the question before going straight to the answer.
Most important is to know the material – and that’s best accomplished by putting in the time (starting early).