Are there any more lessons after lesson 15.
I have finished the lessons and translations on the first page (stream 1) and would like to know if there are any further lessons offered.
Levels and lessons do not really correspond. You completed all the lessons by level 15. I have a little more than half completed all the lessons and am near level 23(I do a lot of practice). There are currently 25 levels. You will have to do real world translations and/or practice to increase your level.