@bjkmom gives excellent advice, especially about going to the professor’s office hours. I have two additional pieces of advice.
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Since you are struggling in multiple classes, I would talk to an academic advisor and find out if you can drop one class and still remain a full time student. At many colleges, the standard load is four classes a semester, but you can drop down to three and still be considered a full time student. If you can do this and are taking four classes (you mention Calc 3, Bio, and Physics, but I’m assuming there is a 4th course), then I would. That way, you can focus more energy on each class. You can make up the credits in the summer if necessary.
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Study in the library and make a firm commitment to yourself about the hours you will be there, e.g., I am going to the library from 7-10 pm. Treat it like you would a job, where you can’t just “no show” because you would rather do something else. Excelling academically IS your job. The general rule of thumb is you should be spending 2-3 hours on homework for every hour you spend in the classroom, so make sure that is happening.
You can do this! Finish strong!