Hello Aspirant,

For Msc Microbiology entrance the whole bachelor's degree syllabus is your area of study. Go through all the topics of bachelor's degree's syllabus of your subject. Don't miss a single topic.

There are so many books are available in market for Msc entrance for Microbiology. You can buy it for self study.
Mainly solve MCQ's as much as you can. Your knowledge will increase for sure.

My best wishes with you
All the best!