Hello Subham Khose,
While filling the form of Engineering Entrance Examinations you should fill your category, I don't think that marksheet of 12th is going to affect in any way.

Hi shubham
Thanks for asking your query.As I can see you have made mistake in document submission in class 12 although you have your caste certificate but you cannot get admission in engineering colleges because 12th board certificate is very important for verification.Therefore please visit your school or board head office to make necessary changes.

Hey,
It seems like that it may create problems during the documents verification of college. In my suggestion you contact to your school for the correction of your mark sheet and then , apply for the admission under caste category. Correction can take time of approximately 5-6 weeks so, Do it as soon as possible .
I hope this information will help you.
If you want more information please let me know.