First of all Jayesh don't say yourseelf an average student. You are brilliant student and will crack IIT this year. Remember there are a lot of students who perform in JEE very well but their test marks are not so good. It is good that you have started revision of phy and maths. But start focussing on inorganic chemistry also as question from this part can be attempted in very short time. Before giving JEE make sure that your inorganic part is covered from NCERT books. Atleast this much you should do.
All the best
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