Is it necessary to give improvement in all subject for jee mains
No , not at all , it is not necessary to write the improvement exam for all the subjects. Improvement exam are ment for those students who thinks that there score in that respective subject is not good , so for them they need to give the improvement exams inorder to improve their score. If you think that your percentage is not enough to get into the NIT/IIT/ CFTI then you should go with the option improvement other wise not necessary.
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