Hello Tarun!

As you have not mentioned name of the institution for which your are preparing to get admission in M.Sc. Life Science, it will be a little difficult to tell you the exact syllabus.
But basically, for all the M.Sc. Life Science entrance tests, questions from your B.Sc. syllabus will be asked.
You may also find one section of General English, G.K., Reasoning in the exam for some institutes comprising of 20-25 marks (like Rajiv Gandhi University). But the highest weightage will be given to Zoology and Botany. Equal number of questions may come from both the subjects (eg. Dibrugarh University).
So, revise your whole UG syllabus thoroughly and in addition to this, go once through the entire biology syllabus of Class 11th and 12th. It will help you.

Feel free to ask if you have any more queries.