ITMS suit 7.1 sp2

I have got a query for ITMS 7.1 sp2..

I am new to IT.

My job is to migrate ITMS 7.1 SP2 to ITMS 7.5

The company where i have perform the task is having ITMS 7.1 SP2.. Can anyone tell me the checklist of the task to perform before migration and after migration with complaince not affected..