Hello,
Yes basic questions will be asked from the class 11th and 12th syllabus from the subject for which you are appearing for the entrance exam.Also, maths questions will be asked.
But you should check your entrance exam syllabus and prepare accordingly because syllabus might vary according to different institutes.
Good luck.

Dear student yes  b.sc entrance exam questions comes from 11th and 12th standard syllabus so you can prepare for your previous syllabus this is better for you.
Thank you.