Hello Veena Sharma
Do not try to learn new concepts in this precious time try to focus on those topics in the JEE Main Maths2 Syllabus you find easy and you're familiar with.
Nothing is impossible. If you work hard enough and practice enough problems you can manage to get a good rank.
You should prepare a proper schedule, be devoted to your goal and work hard with motivation then you can definitely score a good rank in JEE.
All the best for your Exam.