Kind of alarmed at where my midterm grades are

I am only taking 4 classes this semester; Psyc 202 where I have a 63% Math 211 67% Com arts 100- 91.26 And RMI 300 where I have a 71% I’m a freshman and I am worried about how I can do better and improve myself. If anyone has advice on how to study better, please comment or PM me.