Your question is very subjective in nature.
Questions asked in IIT JEE are conceptual in nature. They're of a higher lever than your usual 11th/12th school level examination questions. Moreover, solving them requires a lot of prior practice as well as thorough understanding of your subject material.
I suggest you to join some coaching institute or take help from askiitians.com to guide you properly for JEE. With proper guidance & ample hard work, JEE is not a difficult exam to crack.
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All the best !!!