This mod offers nodes with the numbers 0 - 9, letters and basic mathematical operations for calculation tasks. The solution checking node can be configured to output a reward for a correct answer.
To get access to the teacher features, grant yourself the privilege "teacher" and you will be able to edit the solution checker. Players without the "teacher" privilege (students) will only be able to break blocks outside of an environment with lab blocks. Additionally there's a Allow-dig block which allows students to dig the block above it.