hi !! 

you can visit our page to know more properly how to start preparing for gate exam,

https://engineering.careers360.com/articles/how-to-prepare-for-gate

this has some of the amazing tips and the books recommended for preparing for gate by experts.

Hello,

For cracking gate exam 4 to 8 months are sufficient and for that firstly prepare a plan which includes studing all concepts. Then do revision for that concept, solving mock test papers, previous years question. Also selecting good study material is important so do it wisely.

And 2-3 days before exam do not study any new concept, just revise what you have studied. 

Hope this will halp you. All the best.