The phrase "a really good grade" is correct and usable in written English.
It can be used when discussing academic performance or achievements, particularly in the context of grades received in school or university.
Example: "After studying hard for the exam, I was thrilled to receive a really good grade."
Alternatives: "an excellent grade" or "a high grade".
Assuming his crew skills and interest make him a good candidate for recruiting in his senior year, will it make him more attractive to highly selective colleges if he has really good grades in a basic course load or will he be better off with a number of A.P. classes with grades that may be somewhat less stellar?
"Do you know any parent who has a daughter who says, 'Honey, if you make really good grades, someday when you're 12 or 13 we'll get you your own stripper pole?'" Huckabee asked.
I got really good grades.
School is always number one, and I need to have really good grades if I want to keep doing this.
But the students he sees who are most interested in the sport "tend to have really good grade-point averages and be really fine students," he said.
With regard to his course selection, at the most selective colleges, admissions officers will tell you that they want to see "really good grades" in advanced classes, such as A.P.s, or in an I.B. curriculum.
It seems that college acceptances at top institutions were especially rough this year on "unhooked white girls," or as the writer Steve Cohen explained: smart girls with really good grades and solid SAT scores, but who lack some special "hook" or positioning — for example, being a star athlete, concert pianist or first generation to go to college.
"This year we've accepted people who didn't achieve the grades needed for their conditional offer, whereas I can remember in previous years talking to people who missed theirs but, even though they had really good grades, didn't get into certain universities.
