Many student start preparing from std.8 or 9. it does not mean that you can't crack IIT JEE.
many student crack iit jee just pepearing in one year
For IIT JEE exam you will face very tough comptition.that's why student starts prepearing from 8th and 9th standard.
but you can prepear from 11th standard also.and two year is more than sufficient for IIT JEE prepratioon.
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