Yes you are right it sounds odd.
But it depends upon you that how much you have learnt and how much you have remembered and how much you know about the theories and all concepts.
So if you start with the beginning of all preparation and syllabus it is very hard to prepare for jee in 20 days
Because syllabus is vast and it need time to learn concepts and practice all the concept and chapters.
But if you have prepared and know about everything than you can refresh your concept in 20 days.
So start reading theories and concepts again and again and see the class notebook questions.
So good luck.

Hi

Greetings

You are left with only 20 days and you are starting preparation, with good preparation and strategy you can also crack JEE main ,the first step is to start from Chemistry NCERT you should get through it line by line and remember most of the stuff because 50% of the questions will come directly from NCERT in chemistry ,then those topics in which very strong in physicsand mathematics you should follow some problems on that which are related to JEE main this way you can prepare for JEE main while appearing for the exam just attempt those  questions in which you are very sure.

All the best

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