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1) If you know the concept well. Be confident and read the marked points and solve the tough problems. Check yourself if you can solve the derivation without checking in the register, then you know it, otherwise not.
2) Forget about the difficulty level of a topic. Just preview it before reading it. Mark important topic, problems etc. Summarize it to recall it. Time to test your concepts. Solve previous year questions. Now clear your doubt. Solve hard level problems of JEE Physics or everything will go in vain.
3) Be serious toward every problem as you are in real exam. Do not go for hit and trail. Relate problem with concept of and concept with problem. Proven strategy for thermodynamics. Solve as many questions to get to know the easiest approach possible for the question. Primary focus has to be the given information in the question and now what is needed more to get the solution. This leads to first step to solve the question. Now think of next steps and solve the equations, you can also generate a term and remove it in putting the value. The best thing, put numerical value in last, first solve the variable quantities. Post analyze your methods and questions. Analyze you mistakes and work on it.