Hello Greeshma,

As you didn't mention anything so I'm expecting you to be an undergraduate or you are pursuing it. First of all, I recommend you choose what you want to accomplish in future: Do you want to do your postgraduate, Abroad or in India itself?

GRE (Graduation Record Examination) is a universally comprehended exam which is supervised by ETS ( Education Testing Services). GRE examination is taken by future aspirants for postgraduate programs in foreign universities and its score are approved in over 160 countries colleges and universities across the world. GRE exam is conducted in two types such as- GRE general test and GRE subject test.

GRE general test is the primary requirements for most of the postgraduate programs in Abroad or in India which consists of verbal perception, analytical writing and quantitative reasoning while GRE subject test is specifically for subjects which you are looking for like biology.

In India, there are very few technical colleges which are accepting GRE scores but for not the same course you are opting for, while there are so many colleges or universities in Abroad which approved or accepted GRE scores.

In my opinion, the GRE general test should be given for admission in Postgraduate programs.  Along with the GRE general test, it's best for you to give the subject test (in biology ) which give extra weightage to your academic record either it's your choice.

Hope its help!!