Student loans do not count as taxable income. As such, student loans don't count toward subsidy qualification, but interest may.
Scholarships can count as taxable income, and thus they can affect cost assistance under the ACA's subsidy calculation.
Make sure that your application takes into account ALL taxable income so you can claim the correct amount of cost assistance. When you report information to the Marketplace it estimates your credits for you, but you have the option to adjust your projected Modified Adjusted Gross Income for any deductions you plan to take.