Question

what challenges you are likely to face if you and your friend want to donate your books. ergently please

Answer 1

There are not that much negative challenges that will happen if you donate your books but, here are some:

~You might miss reading your books and there's no way you could take it back
~You might regret donating it and not selling it in a garage sale (or something else) to buy new books
~It is possible that you have some assignments on bringing a novel about this particular thing and you already donated that book

The bottomline is basically:

You never know when you actually need your books, it may be educational, novels, or whatsoever but you will need your books