Dear aspirant
the new academic year for 2020-21 will be opened most probably from November and you can attend offline classes only if you get a written provision from your parents that they allowed, but due to the Coronavirus pandemic it is still not sure of whether there will be any offline session for the year 2020 to 2021.
For the official schedule of class 12 please check the link below
https://school.careers360.com/exams/cbse-class-12th
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