Hello Aspirant!
The final practicals for CBSE Class 12 examination usually starts from the third week of January and continues upto the second week of February. Schools usually opt for a date within this period.

Hello student as per source e Central Board of Secondary Education, CBSE, has reportedly started the preparations for the commencing board examinations for class 10 and 12. If sources are to be believed then the board has already set a basic date sheet for the CBSE 10 and 12 board exams 2020. The main exam is expected to be conducted on February 15, 2020.

Like every year, the CBSE is going to conduct the main subjects first followed by the vocational examinations in the upcoming examination. It has been reported that the chronology of the subjects for the 10th and 12th board examination will be based on the number of students opting for the different subjects.

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