Are there any help forums for student to download papers or books?

Knowledge might be borderless, but why should the authors of textbooks and reference materials work without pay?

You can access some content through Google Scholar.

Most university libraries have subscriptions to databases and ebooks too. If you go through your institution’s library, you should be able to access content without cost.

archive.org
Internet Archive has a lot of libraries joined in and digitalizing their content. If you can’t download the books you need, t least you can read it online.

I hope it helps you.
Peace!

Researchgate has a lot of publications

Also try www.bartleby.com

Lots of reference books as well as fiction.