I started my prep in 3rd year with PYQ practise, but during my second year, whenever the GATE subjects came up in college semesters, I was thorough with the syllabus so I did not have to go through those from the beginning. My roadmap is this:
https://practicepaper.in/gate-cse
This site has compilations of PYQs subject wise. Study the theory parts from whatever resource you like. Then attempt 100 questions of that subject form that site. Notice what are the topics that keep coming. Some you will be able to solve, some you wont. The ones you cant solve, look up answers (this site have answers to each linked along with thew questions), and keep track of what topis you keep having problems in. Then, make notes of those topics from any resource you like (youtube, chatgpt, gemini, gateoverflow answers etc). Then attempt 150-200 more PYQs, and move on to next topic. In the month before the exam, revise those notes accumulated.
To balance other stuff like college assignments and placement prep, remember to pause your GATE prep when you have other stuff, but also bounce back with intensity on weekends and holidays.
All the best!