Hi

You are still in first year you will be studying subjects such as 

1. Basic maths 

2. Mechanics

3. Basic electronics and electrical

4. Information technology

5. Drawing

6. Applied physics 

7. Applied chemistry

But GATE Syallbus consists of higher subject which you will study in following coming years

As of now you can practice general aptitude,  Engineering maths,  Engineering mechanics

Side by side you can check the GATE syllabus and start building foundation on higher subject.  You can study from NPTEL they have all the good lecture series