Hello Pallavi,

Preparing for JEE Main examination required too much dedication and hard work. Always you must start with the easier topics as with that you will be able to cover up a large portion of syllabus in a very less time duration. You must also prepare the notes while studying, this will help during the revision persiod where you can only go through the notes and revise all the topics. try to complete the syllabus before December so that you have an ample time for the revision. 

Also, i would suggest you to study in the weekdays and weekends spend your time in taking the mock tests at the test practise centres.

You can go through our article on Preparation Tips for January via the following link: https://engineering.careers360.com/articles/jee-main-2019-preparation-tips-for-january-exam

Also, refer to the time table for January exam: https://engineering.careers360.com/articles/time-table-for-jee-main-january-2019

All the best! 

If you haven't started yet you simply study from NCERt books and just focus on solved problems and MCQ. Start with Your strength and focus more on topics with most weightage shared below. 

https://engineering.careers360.com/articles/jee-main-syllabus-weightage

Practice atleast 5mocks and analyze weakzones and revise them again. 

Solve all doubts in group study or through college faculty.