Hi shreya., 

This is NikhilReddy 

Yes you can get some mock test sample papers, but those are not efficient and you can't take test in most of the sites they only provide sample papers. 

If you are preparing for jee too you can buy a package from vidhayamindir classes (CD included) 

If you are from Telangana/Ap you can buy Narayana series/Akash series so that you can get state eamcet model mocks too.  They include (5 bitsat, 10 eamcet,  15 jee mains and 10 jee advanced) *when I brought this package from narayana. 

Allen package for bitsat also helps u and its exactly to the final exam standard.

I hope your doubt has been cleared,  for any queries regarding engineere entrance and colleges please follow me and post it. 

Thank you ,  all the best for your bitsat.