I want to pay extra on my first term to cover my second term. But I get a message that the amount is too much. Can I split payments?

Yes!  In My Invoices, your balances due are shown.

1—
On the Program Total line, click the Actions button.

2—
Choose to View & Make Payment.

3—
The entire balance should appear in the Payment Amount box.  If it doesn’t, type it in (or whatever portion of it you plan to pay now) and click Allocate Payment.

The payment will satisfy the first term first and apply the remaining payment to the next term.