West Bengal University Of Technology — college allow book during semester exam

I am final year student of civil engineering, lots of private college allow student to copy during exam. Student use organizar book during exam, also they didn't attain any practical exam but college give them full mark.
Even those students don't know subject name at any semester.
Why those students are got full mark without any preparation and we gate avg number after preparation.
Those college are
1) greater kolkata engineering college, baruipur
2) jld engineering college, baruipur
3) gargi memorial engineering college, baruipur