Prevent Users From Opening the Same Test in Multiple active Tabs?

I am building an online test/exam system in Laravel where users access URLs like:

http://manual5.uishare.local/test/{id}/attempt

I want to prevent a user from:

Opening the same test in multiple tabs

If a test is already active, I want to show a message like: "This test is already active in another session/tab."

My concerns:

1. Reliability
2. Preventing race conditions
3. Handling browser crashes/tab closes
4. Supporting scalability
5. Avoiding false locks
6. Security against bypassing frontend checks