Hello aspirant, 

• Buy or get a copy of previous year question papers if possible with solutions. Having a hard copy is very important and we are going to refer it again and again during whole preparation.
• Refer to syllabus and analyze the number of questions asked in each subject. As all subjects don’t have equal marks, few subjects are preferred over others. 
• Make a priority list of subjects based on marks or preference given it in previous exams. Marks distribution of subject will help you prioritize and allocate preparation time to different subjects. If distribution is not prepared we usually end up in a random preparation and finally will have tough time dealing with important subjects.

To get more detailed information please check, 

https://www.google.com/amp/s/engineering.careers360.com/articles/how-prepare-for-gate-in-6-months/amp

Hello aspirant! Let me to inform you that if you are a fresher student then it's going to be quite difficult for you to prepare for gate 2020. Nevertheless first of all you must know the marks that each subject carries in Gate. And most importantly there are hardly any paper of final year in Ece gate. You must prepare your second year papers and third year papers thoroughly. Like the signal and system carries around 8-9 marks digital communication carries 12-13 marks in the exam. Similarly first note down all the subjects weightage carefully and then study. And you should study according to the syllabus only. Now you must join test series of made easy or other good coaching. Give regular tests. Solve as many previous years question. Now you don't have time to watch nptel videos but in whichever topic you doubt go for nptel videos.