Hello Usman ,thanks for asking this question on this platform.actually JEE main is happens in two phases .

1- first one is JEE main phase 1 for those students who want to pursue or do Bachelor of technology or bachelor of engineering from any Govt college .

2-and second phase is known as JEE main phase 2 for those students who want to do architecture course of 5 year from any college .

Thanks for asking question I hope this will help you.