I can completely relate to your post. Been there. Done that. And in such a situation its completely natural to get tensed. Well i can share the method i used to overcome the same.
I would list down the No of chapters in all the subjects as per the difficulty and interest level. Then i would depending on the The duration left for the exam divide into slot. Also, i would allot extra hours for the subject by either studying at different times of the day or by studying at a stretch. Also, study alternate subjects and include time to rejuvenate yourself, so that your brain is not saturated. For eg: Math Hindi Science English Social Science, etc, just to quote an example.
Shreya I feel the worry is not letting you study, which even u have mentioned. SO for the same, i would suggest to practise relaxation techniques so that you are able to concentrate effectively.
All the best. Take care. Feel free to ping me if you would like to discuss further on the same.