As Jee Main is conducted in various shifts, so question papers are set according to that. It will never happen that one shift paper is too hard to solve and another is the easiest one. Though by expert analysis, 9th January Shift 2 was of moderate difficulty. Physics found to be the toughest by many of the students. Also there were many corrections to be made. You can check the Jee Main January session paper analysis of all shifts done by our experts-

https://engineering.careers360.com/articles/jee-main-analysis