I completed all my exams on an RAF flying scholarship. It is possible to learn, revise, sit and pass with 90%+ every each exam at about 1 1/2 to 2 days each of solid work. Its what I did.. .Get a book called the 'PPL confuser' and use it as a starting point. All the questions in the exams are multi choice and a large majority are simply memory. The PPL confuser contains questions on all the subjects you will be questioned on in the same format as in the exams. Look at the question, learn the rule/information/calculation to find the answer then answer the question. When you test your self don’t bother answering questions you don’t know. Just look up the answer and memorise that. Don’t of course memorise the answers to calculations! Nearly all of Air Law can be done this way as it simple rules. That said however some questions do require a detailed understanding (e.g. the engine and carburettor in the Technical exam and the majority of navigation). Use a good textbook for these.. .Put simply memories simple answers, calculations and read the books for more detailed explanations if required. Do not however read the books back to back. It’s a waste of time. When you get 100% 3 times in a row on the confuser sit the exam.
GOOD LUCK!