I am a freshman taking a junior level Algebra math course in school.
Thank you for helping me!
As other people here have said, freshman year is typically the least important for colleges. They'll put a lot more stock into your junior year and senior fall.
Separately though, no matter what the year, one B- isn't going to kill your chances at anything. Your overall GPA is much more important, and while a B- would pull that down a bit, a mix of As and Bs is still going to give you a strong enough GPA for most places.
Nope, most 99% of colleges only look at your Junior/Senior Year grades. You'll be just fine, and keep up the good work.
Adding on another answer of no! A single grade of a B- won't matter much, if at all, to colleges. I think this might be especially true when you're a freshman taking a junior level course.
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Of course not, my freshman year of high school I got an 89% in the class in first semester and was able to bring it up to an A second semester. For most colleges, freshmen year does not make much of an impact. Don't worry :) Try a bit harder in sophomore year though.