Hello Aspirant,
Here is a list of books that might be helpful for you:-.

1. Invertebrates: R.L. Kotpal

2. Vertebrates: R.L. Kotpal

3.Ecology: PD Sharma

4.Evolution: Vir Bala Rastogi

5.Animal behaviour: V.K Aggarwal

6.physiology: principles of anatomy and physiology by tortora

7.Genetics:concept of genetics by klug and Cummings

8.molecular biology and cell biology: cell and molecular biology by karp

9.biochemistry:lehninger

10.biotechnology:text book of biotechnology by dr. R. C. Dubey

11.comparative anatomy: kardong

12.embryolgy:A.k berry

13.economic zoology:jaiswal

14.immunology: kuby

15.microbiology: Prescott

16.biostatistics: rastogi

17.Zoology for Degree Students BSC I Year by S Chand

18. Botany For Degree Students - 1 BSc by S Chand & Company