Credit score for young adult?

I'm a 20 year old male with a 4 month old credit score of 517. Is this good or bad? Also, how could I raise it? I'd like to purchase a car soon

I do have a credit card with a 300 limit, which I only use about 100 or so bucks each month. I pay each month in full on time. Also, my credit score is 4 months old.

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