Yes, you can apply for another installment plan even if you still have an existing plan! You can do so 60 days after the activation date of your previous tuition installment plan. This is called having Multiple Installment Plans (MIP).
A good payment behavior in your previous tuition installment plans with us will help you become eligible for Multiple Installment Plans (MIP). But the list does not end there! You can check out the other requirements to be eligible to apply for another plan here: Am I Eligible for Multiple Installment Plans.