Is there a way to generate A3 pdf booklets directly from HTML?
I'm attaching a file for reference

1. TS2052-M1-BRIGHTON-INTERNATIONAL-SCHOOL-CLASS 6-A-MATHS.pdf‎ 3.6 MB

Prince does not do imposition, eg. printing two "pages" on one sheet of paper, but you can specify a page size of A4 and then use an external imposition tool to print it to A3.