Hello sir!
There seems to be a slight change in the syllabus for class 12th in Gujrat education board. You don't need to worry about it. The syllabus and the pattern of the question paper is usually provided on the official website.
https://gseb.org/index.html
You can also visit the link given below to check out the syllabus.
https://www.google.com/amp/s/school.careers360.com/articles/gseb-syllabus-class-12/amp
Hope this helps.
Good luck!
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile