Hello
What should be the hardware to host a local single server for 65 concurrent quiz users.
Read this - Installing_Moodle
Read this - Performance_recommendations
Do a search for similar questions in this forum - there will be LOTS.
If you, then, still have questions please come back and ask. I'm not being horrible - it isn't simple to answer
In reply to Howard Miller
Re: Hardware Requirement for 65 Con Current Users
by Visvanath Ratnaweera -
...and the accompanying page https://docs.moodle.org/en/Performance_FAQ. Not a great deal of information but this concurrency is explained there.