I think you are trying to say that you are taking admission this year in Btech Electrical Engineering branch. And you want to take GATE exam. Its great if you are planning to prepare so early. You will have ample time to prepare well. Just give attention in class and follow the course structure at hostel too. Complete the syllabi at time parallel to your classes. Watch videos of topics you don't understand. A lot of GATE materials are available online. You can also join classes if you wish.