Used to be a great App...

Used to be a great App, still one of the best Math Tutor Apps Ive ever used!!! my problem is this... They charge now for every single lesson, some are $4.99, it gets extremely expensive, I would have preferred to pay $9.99 and have access to what I need to learn or as a refresher. This app without hesitation would be a 5 Star on any day, if it wasnt for the fact they charge for the additional charges.

HUGE.CFLFAN about Math., v5.1