sir/mam I rohan studying 12th class now I am can't able to score 500 in weekend exam.
Hello!
Please mention which exam you are talking about and what are you preparing for. If it is for medical entrance (NEET), concentrate on getting your concepts clear first. Study NCERT thoroughly especially for biology as most questions are based on the textbook itself. Same for chemistry too. Solve as many practice questions as possible daily and refer to previous years' question papers also to get a rough idea of the pattern and level of difficulty. All the best!