GATE

Hello Ravula,
GATE 2019 will be conducted by IIT Chennai and they have displayed a very nice webpage where all the required information is available. You can download the syllabus for all the papers that you are interested in preparing for so that you know how and what to study. However for obtaining old question papers along with answers you will just need to Google and you will find hundreds of web pages with this information. As a counsellor of Shiksha I cannot recommend a particular agency or particular institution as it is against the policies hence I would advise you to make use of Google and download all the information that you want and which is easily available on the net. http://gate.iitm.ac.in/Syllabus
Best wishes to you for your GATE 2019.

It is very good that you start your preparation right from the first year of college. Two years of rigorous study have paid off, and you very well deserve a break. Studies include basics of every branch. Just observe everything, and make sure you want to get into technical side, i.e GATE / ESE. Second year usually has some important subjects, make sure you don't study them just for clearing the semesters, but for getting in depth knowledge. It is very tough to do that, but once you do that, it will pay you off very well 2 years later. In the 3rd year, join a coaching. Or, arrange some good study material and start serious preparations. You won't get that much time in final year, plus a head start is always better. In the final year, revise and repeat. Infinite times. Join a few good test series. Attempt all tests. You will gain the momentum that will surely help you perform well on the day.