🔐Exam security: Lock exam attempts

Locked exam attempts can't be started until they are manual unlocked by an admin or educator.

When creating an exam from the communications page select 'Locked'

When an exam is locked and open a student will not be able to start that attempt until it has been unlocked.

To unlock the exam just select the user/s and use the unlock button

When it's unlocked and as long as the open window has been met, users will be able to start their exam as normal