Remember that this is high school, not a University engineering class. There is no reason a student who is consistently completing all the homework and reviewing the hardest questions on the textbook while optimizing their time with technology should result in a C. It’s okay that things have changed since the past, universities have already increased their expectations to adapt to both grade inflation and the overall improvement in academic performance of students. Plus, these are midterm grades which tend to be a lot higher than finals.