Hello aspirant,

After completing 10th, a student is not eligible to get admission into IIT in any course. He/she has to pass 12th with 75 percent for candidates belonging to General, OBC-NCL category and 65 percent to the candidates belonging to the categories like SC, ST, PwD. So the candidate who wants to appear for IIT JEE exam must qualify 12th with 75 percent for General, OBC category and 65 percent for other reserved categories like SC, ST, PwD.

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Dear aspirant,
Without completion of +2 you can't able to write jee mains. Without jee mains you can't able to eligible to get into IIT. SO first you have to complete your +2. Hope it helps you.
Thank you.