Dear aspirant,
The syllabus for jee mains , jee advance and any other entrance exam giving admission in IISC are same, that is class 11 and 12th Ncert.

Here is the link provided below;

https://learn.careers360.com/jee-main-syllabus/

You need to solve more previous year papers and advance level questions to get into IISC
Solve any one particular book first then go to another book and get your basics clear.

Here is the link provided below for better idea of cut off required to get in IISC BANGALORE

https://www.careers360.com/university/indian-institute-of-science-bangalore

I hope I have cleared your doubt, if any issue do contact me.

All the best

IISc Bangalore

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