Hi aditi, its a normally comes to everyone in the time of final exam. You know that u have studied everything but the thing is u have only fear that u will going to forget everything. Don’t try to go with high percentage or with marks instead of that always try to answer every question then automatically u will get good marks. First of all u should have a strong mind that u will definitely going to pass ur exam then only u can take good marks. It is not compulsory that everyone who studies daily only will going to pass the exams but it may be their hardwork and somebody’s luck. so only an exam cannot going to show who u really are so leave that fear and have confidence on urself that u will do the exam to pass. And forget about the further things.