Hello Ziyan,

First of all, you should have the concentration power after that you can follow your timetable easily. Also keep in mind while you are making your timetable that it should not be hard to follow it. In starting, your timetable should be easy to follow, then gradually you can increase your study hours with concentration also. To study smartly, you should follow a proper routine of studing new chapters, solving numericals,and revision also in all three subjects. All three things should be the part of your preparation strategy in daily routine.

Your time table depends upon you and your situation like sleeping time, time for other home works or the time in which you are more comfortable for study i.e. quality time for you (in morning, in evening or in night). So, you should make your time table in your own way.

The main thing is that you have to build your concentration level, then only you can stay focused on your goal. I would like to say that please limit the study time between 10 to 12 hours and please increase your concentration and speed of reading, understanding and solving the problems then you will not face any kind of difficulty.

For preparation of exam, the most important thing is your confidence after that you should know the whole syllabus and make your plan properly for learning new chapters, solving the numericals and revision. All three things should be the part of your preparation strategy in daily routine.

Your basics in Physics, Chemistry & Mathematics should be very clear upto 12th std. You should read the NCERT books for basics. Then HC Verma for Physics, RD Sharma for Mathematics, OP Tendon for Physical & Inorganic Chemistry, and Organic Chemistry of "Arihant Publication" for detail or extra knowledge. 
You should also try to solve the previous years question papers, this helps too much and you should also give the mock test to rectify yourself and build your confidence level.

For more preparation tips, importants topics & books, you can go through the link given below

Https://engineering.careers360.com/articles/jee-main-2019

In this way, you can prepare well for the JEE Main and the JEE Advanced.

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All the best for your examination.

A time table for JEE Main preparation helps you to plan your study schedule keeping in mind the time left for preparation, time each subject and topic requires, time for revitalising self and also for revision of the entire JEE Main syllabus. As the exam will be conducted twice January and April 2019. You can check for both time table with the given below link.

https://engineering.careers360.com/articles/time-table-for-jee-main-2019-preparation

Good Luck!