Let's tackle this question through some key factors. JEE Mains is more dependent on the time factor. The more quick you are at problem solving then the more easier it becomes. Generally in JEE Mains, a question would not involve more than a single concept so it the more vast your knowledge is the more useful it would be. Once you find the concept involved in that question it would be just the problem solving left which generally wouldn’t be lengthy as lengthy as in Advanced.

Coming to JEE Advanced, here the number of questions decreases, because it would take more time to solve each question, as every question is has interlinked concepts. This has a related tie-in to the level of questions as well. With a basic knowledge of concepts, one might be able to solve questions in Mains, but in Advanced, that might not be the case.

So, in a nutshell, Advanced is more application oriented, with a thorough understanding of most concepts required to solve a question. The number of questions in Mains are more than advanced, but the level and hence the difficutly of Advanced is higher than Mains.

Hope this helped!

Hey friend!

JEE Mains is determined to obtain a deeper understanding of the basic concepts of 11th and 12th class subjects. Whereas Advanced has subjects other than 11th and 12th. It focuses on evaluating the abilities of candidates on the basis of their problem-solving skills. IIT JEE Main is conducted twice a year by NTA for colleges such as NITs, GFTIs, IIITs and other engineering colleges. Whereas IIT JEE Advanced is conducted by IITs themselves for admission to all IITs. T Toappear on JEE Advanced, a candidate must appear on JEE Main.

All the best friend!