Hello aspirant

Hope you are doing great there . First of all you need to know that the time left with you is a bit less , but yet everything is still in your hands . First of all I would suggest you to focus on your cbse wisely which is going to be held in just 1 month as you told . Also the concepts which you will learn for cbse will definitely help you some way in your jee mains . Once your cbse target is achieved , without wasting time , shift all your focus towards jee since if I am not wrong after all this you will be left with about 2 months . In those 2 months , you have to work on strong chapters . do not forget to complete easy chapters like mathematical reasoning , statistics , quardratic equation , inorganic chemistry and so on as thee chapter act like score boosters .

I hope my answer helps

Wish you all the very best!