We use multiple practices to guarantee the quality of our notes.
First of all we review the notes manually. We don;t approve notes automatically. We check if the notes are real and relevant.
We also check if we can verify the grades of the author. Authors can submit their academic transcript if they choose to and we review it to confirm the grades. If we can confirm the grades, you will see a green tick right next to grades. See the image below.
Finally we let you to be the judge of the quality. That means, if you are not satisfied with an item that you have purchased, you may return the item within 7 days from the order date for a full or partial refund.