Are the 30% deleted portions announced only for Board exams or for JEE 2021 also?
CBSE, ICSE and many other Boards have deleted 30% portions from the syllabus for 2020-21 session. This is done for the convenience of students as they have not been able to attend regular classes because of Corona pandemic. IIT JAB and Ministry of Education may delete the same portion from JEE 2021 syllabus also.
JEE Main 2021 Information bulletin is likely to be available from November or December this year which will have the reduced syllabus (if made).
Hope it helps.