Hey,
Yeah JEE Mains improvement can be given a year later like you can drop a year and then give it after a year. But its chance is given once only. So you can give it one more time.
Yeah you have to give all the subjects, that is you have to give whole JEE Mains again.

Hope this solves your query.
Good Luck!!

no, you will have to wait for january shift of 2020

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