Graduate to a key become a street scholar
A scholar is someone who is extremely skilled in one area which usually involves graduating from college or training to be considered one. A street scholar would be someone who is skilled in illegal activities of the streets, in this case, drug dealing. Someone would “graduate” to selling more quantities of a drug or selling a drug that is worth more and become a street scholar.
A key is slang for kilo, which is 1,000 grams and commonly associated with cocaine. Anyone able to acquire a large amount of cocaine like this would have to be very skilled in dealing since it is has an estimated worth of $16,000-$24,000.
To help improve the meaning of these lyrics, visit "Tale Of Two Cities" by Murs (Ft. 9th Wonder) and leave a comment on the lyrics box