Hello sanjay chauhan.  Firstly chemistry is a subject that be banked on for score in jee mains. In comparison with physics and maths, chemistry is the easier one for score. Regarding your question of how to improve organic chemistry from basics.
Organic chemistry is full of equations and reactions. Alkanes, alkenes, alkynes and their different type of reactions with different chemicals covers most of it.
So first make a comparison chart of these three. For example alkanes reacting with chlorine, alkene with chlorine, alkyne with chlorine. Like wise. And give a part of your day for practice. Some reactions needs to be remembered. So set a time in your day to practice the reactions.
Hope this helps. All the best

Hello Sanjay Chauhan,

To improve in the organic chemistry  from basics for JEE mains April 2020 ,Prepare more previous questions to know how the questions are used to be in the question paper and also refer more books ,it helps you to improve your basis.

Hope this helps you...

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