Answer:

DPLUS

Answer	Crossword Clue
DPLUS	69, usually
DPLUS	It's barely passing
DPLUS	Barely passing grade

DPLUS	Passing grade that won't please parents
DPLUS	Low grade
DPLUS	Not-so-good mark
DPLUS	It's close to C
DPLUS	Not quite a C
DPLUS	Not good at all
DPLUS	Grade below C
DPLUS	Poor mark

DPLUS	Barely passing
DPLUS	Low mark
DPLUS	Not-so-good grade
DPLUS	Poor grade
DPLUS	Bad mark
DPLUS	Below-average grade
DPLUS	Passing mark
DPLUS	Figure in the high 60s

DPLUS	Pretty poor grade
DPLUS	Grade to be concerned about
DPLUS	It's just below C level
DPLUS	Poor passing grade
DPLUS	Lousy mark
DPLUS	It's very close to C
DPLUS	Not the highest grade
DPLUS	One passes with it, barely

DPLUS	One barely passes with it
DPLUS	Just below C level?
DPLUS	It's not C-worthy