Hello there!

The answer is No.

You need not to study whole syllabus of class 11th to give exam in class 12th.

This is the fact that class 11th forms the basis for class 12th, so you need to clear your concepts in class 11th itself.

Maharashtra board has reduced the syllabus for class 11 and 12th this year.

You can either check the official website or you can click the link below for more detailed information:

https://school-careers360-com.cdn.ampproject.org/v/s/school.careers360.com/articles/maharashtra-hsc-syllabus/amp?amp_js_v=a6&amp_gsa=1&usqp=mq331AQKKAFQArABIIACAw%3D%3D#aoh=16273998171152&referrer=https%3A%2F%2Fwww.google.com&amp_tf=From%20%251%24s&ampshare=https%3A%2F%2Fschool.careers360.com%2Farticles%2Fmaharashtra-hsc-syllabus

hope it helps.

Stay safe.

Good luck.