As it currently stands, the UI frames free lessons as '0$ purchases' so to speak. I believe that it would improve the attractiveness of the lesson and readability if it instead replaced most of the '0$' with 'FREE'. I also believe words like 'Purchase' should be removed entirely and replaced with some other wording.

Perhaps instead of 'Proceed to Buy' we can have 'Proceed to schedule' or 'Schedule Lesson' . The yellow '0$' would be replaced with 'FREE" and so on.