Hello,

No you don't need to give all the subjects for improvement exam. Only those that you have failed or the subjects that you think you want to get better score only those subjects you need to give. There is no need to give all the subjects. If you want to get a better over all percentage then you can give the exams in which you did get a good score.

Hello Jayraj

Improvement exam is all about improving your score and percent and it all depends on you if you  , it is not as such necessary  to give the exam of all subject in in improvement exam . But i would suggest try to give the exam of that subject only in which you are confident enough that you will score better marks than previous one .

Thank you

good luck