Since you are asking about concurrent users on system, be a good idea to give number of students in each of the groups you've envisioned/created. How many users are in your group 3?
Number of users on a system does involve configuation of both web service/server and DB server. Both would need tweaking as default values are not enough.
Assuming Linux hosting of some sort, install the following on the/a web server:
Apache2Buddy and MySQLtuner ... both are perl scripts designed to help with configuration of Apache web server(s) and MySQL/MariaDB.
The following is a pretty good explanation of the tools:
https://www.linode.com/docs/web-servers/apache-tips-and-tricks/tuning-your-apache-server/
'SoS', Ken
Number of users on a system does involve configuation of both web service/server and DB server. Both would need tweaking as default values are not enough.
Assuming Linux hosting of some sort, install the following on the/a web server:
Apache2Buddy and MySQLtuner ... both are perl scripts designed to help with configuration of Apache web server(s) and MySQL/MariaDB.
The following is a pretty good explanation of the tools:
https://www.linode.com/docs/web-servers/apache-tips-and-tricks/tuning-your-apache-server/
'SoS', Ken