See if you want to go for the problems of JEE ADVANCED, then you need to clear your basics very well. Now having a clear concept is only possible if you know your theory well then you will get the logical apprehension to this problems. So in order to have a good theory and some basic problems, you need to solve some reference books. This is the normal standards. Although, you can experiment and try if its possible or not but in most of the cases, without solving some basic problems, jumping into the JEE ADVANCED can be demotivating.

For more information regarding the JEE ADVANCED preparation tips consider the link below:

https://engineering.careers360.com/articles/jee-advanced-preparation-tips

I hope this helps. Wish you a great eve!