Dear aspirant

Sure you can prepare for jee mains in 1st year because if you see the syllabus of 1st year engineering that is quite similar to class 12th so it becomes quite easy . 

The key points you can remember

1.revise once atleast your previous notes of chemistry because it is very scoring in jee mains and takes less time to attempt .

2.practice two questions of math from every topic of mathematics daily . This will help you to revise all concepts of maths.

3 . For physics it is less scoring in jee mains so you can prepare it after when you are done with maths and chemistry.

Stay focused and confident and go for it .

All the best ….

Hello!

Yes, you can give JEE in your first year.

Begin with the notes and books for JEE which helped you in the previous years, as without them it will be difficult to sit for JEE again.

Look for the solved answer in the paper. If you can understand the solutions, then you may proceed ahead after making sure you understood the concept.