The phrase "have good grades" is correct and can be used in written English.
This phrase can be used when talking about a student's academic performance. For example: "My goal is to have good grades so I can get into a top university."
Have good grades – your high school grades are really important.
Bill Jones, who owned it, said: "Do you have good grades?
Once again Georgia State mines its data, this time looking for students who owe small amounts of money, are close to graduation, and have good grades.
South toward the horizon is the private high school he attended ("Nothing to brag about. I didn't really have good grades, and my parents thought it would help").
To get into West Point in the first place, you must have good grades, athletic ability, and leadership qualities; you might say that the cadets already had grit.
"For people like me who have good grades but are not in the super-elite, there are not as many options for getting a job in advance," said Zachary Burd, 35, who just graduated from Southern Methodist University.
It's the equivalent, in America, of expecting the Asian kid to have good grades, the black man to be the best dancer and the Jewish guy to be well-read and have some slight mother issues.
"Fifteen years ago it seemed La Guardia would take the brilliant graffiti artist who didn't have good grades," said Joseph Cassidy, principal of the Clinton School, a middle school that sends many students to La Guardia.
Criticising some students' "poor choices", Dr Wendy Piatt, director general of the Russell Group, said: "Universities need students not only to have good grades, but grades in the right subjects".
If you have good grades you can apply anywhere".
For kids who have good grades but test-anxiety, that can be a real blessing.
