You have almost 1 year to appear for JEE main January exam you can follow the following tips to do well in the exam.

• If you feel your physics is weak then start by developing concepts it is a proven fact that most of the aspirants start by following HC Verma so I strongly recommend you to switch to HC Verma for physics the book is very well written and easy to understand solve all the problems.
• previous year papers are very helpful for scoring good marks in JEE main and will also help you to understand the important topics which are frequently asked in exam.
• you should be fully aware of syllabus and while reading you should be specifically mark it whether this particular topic is from the syllabus and how much questions are asked on that particular topic from the previous years.
• The fact is that there are certain topics which have higher question chances to occur then the other but at the same time it is also that almost all the topics are asked in the exam there for want leave any topic.

Ifyou follow the other mention tips when you have lot of time and can improve open your pic topics is you mentioned physics and can work upon it to excel in the exam.