Dear candidate, I am providing you some links, you can read and compare the difficulty levels of all papers of JEE Main:

• July session, Day 1(20 July):

https://news.careers360.com/jee-main-2021-session-3-live-updates-day-1-guidelines-timings-coverage-and-student-reactions

https://news.careers360.com/jee-main-exam-analysis-2021-for-july-20-shift-1-know-all-details-here (Shift 1)

https://news.careers360.com/jee-main-exam-analysis-2021-for-july-20-shift-2 (Shift 2)

• July session, Day 2(22 July):

https://news.careers360.com/jee-main-2021-session-3-july-22-live-updates-day-2-exam-analysis-shift-timings-pattern-answer-keys-nta-latest-news

https://news.careers360.com/jee-main-exam-analysis-2021-for-july-22-shift-2-know-all-details-here

• July session, Day 3(25 July):

https://news.careers360.com/jee-main-2021-exam-analysis-for-july-25-shift-1-check-difficulty-level (Shift 1)

https://news.careers360.com/jee-main-2021-exam-analysis-for-july-25-shift-2 (Shift 2)

• July session, Day 4(27 July):

https://news.careers360.com/jee-main-2021-exam-analysis-for-july-27-shift-1 (Shift 1)

https://news.careers360.com/jee-main-analysis-2021-for-july-27-shift-2-released-know-difficulty-level (Shift 2)

Hope, it helps!