Grades! and How to Unlock them?

Every user of the Planet of Students platform can experience 5 distinct grades, according to their performance. Each grade gets unlocked upon achieving specific targets. And each grade comes with a curated list of benefits to the students. Upon achieving the given target, the particular user will be auto-upgraded to the next grade.
Grade E: It’s the default grade when an account is created.
Grade D: Once the student completed their Career Advancement Course, Grade D gets unlocked.
Grade C: To unlock Grade C, the user must generate 10 Referrals to Planet of Students.
Grade B: To upgrade to this level, the user must unlock atleast 5 individual badges.
Grade A: The user can unlock grade A by giving 1000 coins they have earned so far.
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