MHT CET 2021 syllabus includes 20% of  the questions from class 11th and 80% of questions from class 12th syllabus.

Physics -

https://static.careers360.mobi/media/uploads/froala_editor/files/Physics_xMjvPW5.pdf

Chemistry -

https://static.careers360.mobi/media/uploads/froala_editor/files/Chemistry_W0HkWEK.pdf

Biology -

https://engineering.careers360.com/articles/mht-cet-syllabus

Official Letter regarding syllabus and marking scheme :

https://view.mahacet.org/mahacet/admin/news_document/MHTCET2021Syllabus24122020%20(2).pdf

Hope it helps !