Hello candidate,

Nowadays there are several books available online for microbiology MCQ preparations, but I am suggesting you some of the best as per me-

1. iGenetics by  Peter Russell

2. Textbook of Microbiology by Prescott

3. Immunology by Kuby

4. Medical microbiology by Anathanarayan

5. Food microbiology by James Jay

6. Genetics by Benjamin Pierce

Hope you found it helpful!!

If you have any further queries, feel free to post it here!!