What should we choose Attending or non attending school with preparation for jee.
It depends on individual choice. Majority of students who clear JEE attend regular schooling. Dummy schools are more popular at places like Kota.
Read this post : Is Joining Dummy School a Good Option for JEE/ NEET?
If you go for regular school (attending), this post would be helpful : Tips to Handle School and IIT JEE Preparation at the Same Time