Hello student that's very common there's nothing to worry about just focus on your daily study only that'll help you in scoring good marks.Be True to Yourself:
Since, very less time is left, you should be sincere and work on your schedule. ...
Physics:
Chemistry:
Biology:
Biology carries most no. of marks so start preparing Biology first. .
You should know the exam pattern and marking scheme very well and should prepare accordingly.
Marks distribution.

Also
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Feel free to comment if you have any doubt
Good luck