hey,

the basic eligibility criteria to appear for NEET exam is candidate must have passed  or appearing their 10+2 from recognized board with science stream subject having physics, chemistry and biology and candidate must have secured a minimum aggregate of 50 percent marks in PCB subjects altogether , for OBC/SC/ST it is 40 percent and for PWD it is 45 percent.

you cannot replace any subject with any other non considerable  subject.

hope this helps

good luck!

Physics, Chemistry and Biology are the only subjects whose aggregate is considered for NEET. Even if the marks in one of these 3 sujects are lesser and you have an additional subject in which you scored higher, the subjects will not be swapped. This is because NEET only considers Physics, Chemistry, Biology and English and no other subject. Even English is not considered for calculating your aggregate. And to be eligible for NEET, you should have completed your 12th, passed in all subjects and secure a minimum aggregate of 50% in Physics, Chemistry and Biology. It is 50% for General Category, 45% for PWD and 40% for OBC,SC,ST. Now if you belong to OBC Category, the Category you belong to should be also listed in the Central OBC list. Or else you will be considered as General Category and so you have to secure a minimum aggregate of 50% in Physics, Chemistry and Biology. This 50% is inclusive of the Theory and Practical marks scored in Physics, Chemistry and Biology collectively. You needn't score 50% in Physics, 50% in Chemistry and 50% in Biology separately. You need an aggregate of 50% or 40% depending on your Category as an aggregate in Physics, Chemistry and Biology. And along with Physics, Chemistry and Biology, you should also have studied English as one of the core subjects in your 12th. And so if you have scored less in Chemistry and do not meet the 40-50% aggregate criteria, then you will not be eligible for NEET. But no way would another subject marks will be added.