Hi Sidhant

Every university has its own admission procedure. So it will differ from university to university.

B.E Chemical Engineering is a full-time undergraduate 4 year program in chemical engineering. For admission to this course you have to give various entrance examinations like AIEE , JEE , etc.

Some colleges that provide this course are :

IIT , Bombay

Birla institute of technology and science

anna university

Chandigarh university

So for this course 12th cbse marks are just qualification to sit for entrance exam.

BSc Life science is a three undergraduate course in India. Its study mainly focus on studying of various life processes. Admission to this course is mostly merit-based. So , your 12th score will be only criteria for admission. You ca apply in Delhi university almost all colleges provide this course.

Hope it helps :)