By writing JEE mains exam easily, i'm guessing you mean how to approach the questions to maximise the score.

Cracking JEE Main easily is more about smart strategy than just hard study. First, use the three-round method. In Round 1 (about 60 minutes), solve only easy questions and skip anything taking more than 2 minutes. In Round 2 (about 90 minutes), attempt moderate questions that need proper calculation. In the final 30 minutes, try difficult questions or recheck answers.

You can follow this order - First solve Chemistry, then Physics, and at last attempt Maths. Most of the questions in Chemistry are asked directly and can be solved quickly, boosting the confidence. Physics comes next, and keep Maths for last since it is lengthy. Also if you get stuck in any question for more than 60 seconds, mark it for review or skip it and if time allows, then return to it later.