How to unlock the next unit?

How to unlock the next unit?

All the courses which are there in the App are not free courses. For the Demo courses, you can not unlock the next unit because they are paid courses and demo of the 1st unit is open for everyone.
For the free courses, like AICTE's Free course of "Professional communication" and "Interview skill course", you can unlock the next unit by solving the terminal quiz which is there at the end of each unit. You need to score 8 out of 10 to clear the terminal quiz and unlock the next unit.