You might be able to clear JEE mains but then advance will be tougher for you. If you are happy enough with NITS or some state government engineering colleges through MAINS score, then yes you can clear it. Because out of the 25 questions of chemistry, there will be around 8-10 from Organic part and if you leave them it's absolutely fine obviously provided that your maths and physics are really quite strong that you're able to at least write 17 out of 25 correct in each. Then try to score around 140 that is 35 questions right from 50 of Physics and Maths and try to gather around 20 marks atleast with the help of physical and inorganic chemistry. And then with a score around 150, you can get good colleges.

Best wishes. Thank you.