Hii there, sorry but your question is not clear. For which examination you are asking about the topics. Please specify it. But if your question is about CBSE 12th, then yes CBSE did reduce the syllabus by 30% because of classroom teaching time reduction. I will suggest you to visit the official site of CBSE to know the deleted topics because they cover all streams and almost all subjects.

Please visit the link for detailed information:

https://news.careers360.com/deleted-parts-in-ncerts-alternative-calendar-cbse-on-syllabus-change/amp#aoh=15998338532765&amp_ct=1599833868826&csi=1&referrer=https%3A%2F%2Fwww.google.com&amp_tf=From%20%251%24s

Good luck!