Hello Sarthak

You may appear for Neet as well as upsc at the same time but you won't be able to prepare for both exams.

It will be better if you focus on any one entrance exam  and prepare .

Neet is a biggest entrance exam related to medical courses while UPSC entrance exam is given to become IAS

Both exams need dedication and very hard work.

You must decide in which field you wish to build your career then accordingly go for neet or upsc.