Yes. It's all about paying the loan back as fast as possible (obviously), and, any time you make a payment, the amount of the payment that goes towards interest is dependent on the interest rate and how much time has passed since the last payment. Generally, amortized loans have a daily interest rate, so, each day that passes will cause one more 365th of the interest rate apply towards interest vs principal. For example, a $10,000 loan with a 5% interest rate will have a daily interest rate of 0 0137%, which would cost about $1.37 in interest daily.
So, after letting 30 days pass, then making your first payment, you would owe $41.10 in interest, so, whatever your payment amount is each month, interest is always paid first. However, any additional capital applied against the loan beyond the minimum payment is applied 100% towards principal because the interest has been 100% been paid up until that point via the first $41.10 of your payment. It's all about the time-value of money--- a dollar today is worth more than a dollar tomorrow because of the power of interest (especially compounding interest), so getting the lender their money back ASAP will reduce that interest.
Also, the APR (which is the amount of total interest owed on a loan in a year time span when accounting for compounding and capitalization, reflected as a percentage of principal) will be dependent on whether the plan's rate of capitalization or how often a loan turns owed interest into principal and starts charging interest on the new, higher amount loan. Generally, installment loans have either no capitalization or slower rates of capitalization than, say, credit cards, who capitalize monthly at the very least or even daily. If that $10,000 loan example I used were to compound daily, then you would owe $41.18 in interest on the first payment after 30 days, not $41.10). Amortizing loans usually keep the principal amount the same and then vary the amount of any given payment thst goes towards interest based on the time between payments and interest rate. So, with each payment, the rate at which you accrue interest goes down because the interest rate is now being applied against a smaller principal.
Tl;DR - pay as much as you can as fast as you can