zonca said:
their fee is 350 bucks so i want to know if its worth the money
I would say a hard NO.
if you have any other recommendations will also be welcome!
The top rated post here is probably the best set of dead-tree books you will find, enough to study for several years, and getting them used is cheaper than the fee you listed.
There are many free tutorials and guides, but I haven't seen anything better than the books in that list. Either C++ Primer if you are new, or Accelerated C++ if you know the basics of programming.
The books are growing a little dated and don't include all the newer fancy features introduced to the language, but neither does the N64 toolset.
The N64 system ran from 1996-2002, so you will want to know programming skills from the same era. That's the time before the first C++ standard through just before the first update to the standard. Most of the tools of the era were C, or a version of pre-standard C++. Some of the later tools did their best to respect the standard even if they couldn't fully support it. All the c++03 standard and later changes will be too new for the real SDKs, and the more modern-approach tools will still benefit from knowing what the systems were built with in mind.