Question

how I can make part of 308 pages into 3 parts in my notebook? ​

Answer 1

Use first 2 pages for index of main parts

Then 3 pages of each part for index in detail

Then total pages left =308-5=303

In 3 parts it will be 303/3=101

Answer 2

just you to make 102 sets of pages so that you can make 3 parts of book