Ok... So ur main target is Jee main. so first thing is to complete the syllabus with solving some initial level questions(i hope u r done with this!)
Next is u will have to device a revision schedule so that u can revise the complete syllabus within a month.
Note that revision means solving questions much more than reading theory.
Also in between these revision u should be giving mock tests.(atleast twice a week)
The mains only chapters like - relations,reasoning,biomolecules,semiconductors,communications,enviormental chem,polymers. Can increse your score by 30 marks! So dont ignore them as they r relatively easy!
Never forget chem and physics NCERT for JEE main.
During revision also read NCERT.
There can be a question in Main from simplest part of NCERT too..and there have been question from Damping and forced oscillations too!
In the last one month , u should be giving mocktests including the previous year papers!
Which shall also include the papers conducted for Janruary main'19.with the revision of topics u r not sure of...or u feared of!
I would recommend u not to leave any chapter (esp physics)as u have plent of time.
Being a dropper u can manage this easily.
For physics take a topic each day and solve plenty of questions..start with HCV if u havent done it yet!