What materials are available offline for the C++ exam?

Question

C++ / C#

Hi all.
In two weeks I am writing an e-exam in C++.
You can use everything except the Internet. But since the time is strictly two hours, this does not help much.
I downloaded de.cppreference.com/w and a couple of other documentation PDFs. Unfortunately de.cppreference.com/w there is no normal search offline.
I want to ask you, maybe you have some favorite resource that you can download and for which the search will work ???
thanks in advance

Answer 1

https://velocity.silverlakesoftware.com/
An analogue for macos is called dash