Hello aspirant I am here for helping you.
You don't need to cancel your registration of JEE mains you can do a single thing that rest it as it is if you do not go for exam then there will be no problem,
and after completing your improvement examination you can register again and can go for it but remember your one chance will be counted here,
even if you don't want to waste your chance then you can cancel the registration.
I hope you got it.
Feel free to ask any query in comment section.
Best of luck.

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