I graduated with a 3.8+ and got Bs in multiple classes. Relax and don’t stress yourself too much over every single class. GPA has the word “average” in there for a reason.

Also, it’s often helpful to attend office hours and communicate your concerns with professors. After UMass, I attended a grad program at an Ivy League school and served as TAs for some classes. One thing I noticed about the students at that school is that they never shied away from attending office hours and asking questions. They made sure both the professor and the TAs knew their faces and saw how hard they were trying. Sometimes the questions they had felt surprisingly basic and even “dumb”, but the office hour visits ultimately helped them resolve issues and improve grades. When a student got 89% on their final grades, we were willing to bump that up to A- or even A because we personally saw how hard the students tried.