Broadly covers academic grades, sports results, business performance, and any measurable outcome or track record.
My grades this semester were better than last year.
He came out on top in sales performance.
After studying every day, my grades improved.
I played video games all the time, and my grades dropped.
He has good grades in math.
I want to improve my grades on the next test.
That athlete achieved a great result at the world competition.
成績 refers to measurable grades or performance records, while 成果 is the broader accomplishment or fruit of labor itself.
personal results; individual score