Hello Md Daud,
The exams are from feb-3 to march-31. you can check out the dates on which yoiu have the exam
ISC Class 12 Time Table 2020
Exam Starting Time
etc..
for the complete details visit the below link:
https://school.careers360.com/articles/isc-12th-date-sheet
Hope it helps.
All the best.
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