Hello,
You can download UP board class 12 biology model papers from the link below
https://school.careers360.com/articles/up-board-12th-model-paper
Also, you will get model papers for all the other subjects from the link.
You can also check this link for the syllabus
https://school.careers360.com/hi/articles/up-board-12th-syllabus
Good luck!
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