I've tested the Subscription Plan – Flat Price (Tiered) and found no issues with either trial or non-trial purchases. For trial purchases, after the trial period ends, the student's progress remains unchanged as expected.


| First Unit | Last Unit | Per Unit |
| 1 | 1 | $10 |
| 2 | 5 | $11 |
| 6 | ∞ | $15 |