There is an equal weightage for all the four subjects(physics,chemistry,maths,biology) in IISER aptitude test. The questions will be theory based and answering them will be possible only if we are thorough with NCERT.

Hello Pooja bhandari  ,

Yes, The Aptitude test of IISER does contain Biology also.

Basically the 11th and 12th standards subjects are asked in the aptitude test for the subjects of MATHS, BIOLOGY, PHYSICS, CHEMISTRY.

for more details do visit the link below :

https://engineering.careers360.com/articles/iiser-syllabus-exam-pattern

Hope that helps!