Do you have to get all your junior high credits to graduate high school?

Do you have to get all your junior high credits to graduate high school?
The way you can get all your credits in order to graduate is to do the everyday basics in school such as going to school/ class, Completing your homework assignments, and doing the regular basics in school as a good student. For some school there is a amount of credits you need to graduate so for example at Lincoln M. Alexander Secondary School you need 30 credits and that is alot. Plus the Compulsory Credits.