It is not possible to have one standard preparation strategy for this examination. Divide your time into parts as you may like and devote certain specific hours daily for learning and solving.
A lot of factors are involved in making a good strategy for any examination, but as far as the GATE exam is concerned, one thing that can help you make the plan realistic can be - setting daily and weekly targets for subjects to be covered.
As far as time-table and preparation strategy are concerned then please go through several posts which you can find on this platform of various toppers and try to devise an idea as to how you can incorporate them into your daily routine. Time management is a very important aspect of preparation but it depends on whether we are preparing full-time or preparing with a job or preparing while having college and each of these aspects comes with its own challenges and problems and accordingly the solutions.