Hello aspirant,

There are various standard books for each and every subject.

Biochemistry- Lehninger

Microbiology-Prescott and Pelczar

Genetics and Molecular Biology-Peter Snustad

Genetic Engineering- TA Brown

Plant Biotechnology- Bhojwani and HS Chawla

Animal Biotechnology-Ian Freshney

Immunology-Kuby

Bioprocess engineering- Schuler and Kargi, PM Doran

Bioinformatics-Jin Xiong.

These are some of the books that will help aspirants to get basic concepts of the topics that come in GATE.

Also buy Pathfinder’s single book and Arihant’s as well. Solving as many questions as possible will increase the confidence and question solving abilities, for this, solve last 10 year papers of GATE-BT, GATE-Lifesciences and DBT-JRF.

At the end for basic Maths follow some lectures for free from YouTube and for aptitute questions solve from the book Wiley Online Library Aptipedia.

Hope this helps,

All the Best!!