Hello Aspirant,

Since you have not mentioned the name of examination so it is quite difficult for us to guide you with an accurate information but according to your profile you are an engineering aspirant so you might be asking for JEE-Main 2021, if not then please mention the correct one.

So for JEE-Main 2021 Application form if you don't have your reserved category certificate for your respective category right now then you can submit the self undertaking which declares that you will submit the original and valid caste certificate later on at the time of admission.

And you can download the self undertaking from the official portal of NTA, for which link is also given below :-

https://jeemain.nta.nic.in/webinfo2021/File/GetFile?FileId=5&LangId=P

When you visit on the above link you will find a PDF and on page no.9 there is undertaking format which you have to download and after filling it you have to upload it on the place of category certificate in the JEE-Main 2021 Application form.

Now to bind-up your preparation of JEE-Main 2021 kindly check out the link given below :-

https://learn.careers360.com/jee-main-rank-booster/?icn=jee-rank-booster&ici=c360-Exam-View-WEB-Sticky

I hope this information helps you.

Good Luck!!