You are certainly free to ask if they will sign this agreement. I think the chances of them agreeing to do so are pretty much slim to none. I can't speak with NV law on notarization, but I don't know any state the requires notarization on these types of contracts.
This answer is for informational purposes only and is not legal advice regarding your question and does not establish an attorney-client relationship.
Usually notary signatures are for real estate deeds, loan documents (pertaining to real estate), court affidavits and similar court documents...but not ordinary contracts of the type you speak to.
As for the confidentiality agreement, that would be voluntary on the School's part. You have told us nothing about why the issue even arises to get a sense of whether you are being disciplined and are now defending yourself or it is for some other matter that is not interfering with your rights to privacy, etc. Consider whether the school can simply expel you for failure to cooperate? If this is a serious matter then you need to see a lawyer who is conversant in defending college students for charges of the type I allude to but can only speculate is the underlying issue here. Good luck.
My answer is not intended to be giving legal advice and this topic can be a complex area where the advice of a licensed attorney in your State should be obtained.
A confidentiality clause or nondisclosure agreement need not be notarized in Nevada to be effective. Whether the college will sign it really depends on the circumstances, but student records are not public records.
This is general information that is not to be construed as creating an attorney-client relationship. Please consult with an attorney to obtain legal advice with regard to your specific situation.