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I'm currious, are you building credit for the first time or is this disaster recovery? Being in deferred student loans I'm going to go out on a limb and assume building.
You also menetioned a car loan. Credit diversity is a good thing but only if you are paying it down way more the the minimums due. Medical bills on credit reports are weighted way lower than all other types because they we'rent optional purchases. Medical is understood to be "incure the debt or die", not optional. Most lendors get that but it will still drag you down for a few years (decreasing scale - up to seven years) if you didn't pay up in a timely fashion. Student loans are installment debts (with slightly less weight). Deffered student loans are installment loans that you will be paying on soon that will also probably increase in principal before you start paying. These are also understood as a fact of life (for most of us who go to college) but still weigh on your ability to pay other debts. Simply put, you're high risk right now if you carry a ballance on the starter cards you have now and have other looming debts. Reducing that risk ONLY takes money. Easier said than done but take if from a guy who messed up in his 20's and is just now back in good graces in his 40's... Pay-pay-pay NOW. It will show the creditors that you are worthy of their risk.
If I'm wrong about ANYTHING I'm sure others here will point it out rapidly.