Studying over the summer to skip a level

They do.Again not cheap. It’s 4 weeks and $6595
https://www.middleburyinteractive.com/summer-language-academy/apply/dates-tuition

In general, 7-8 weeks of FT study during the summer is equal to 1 year of college credits during the academic year or roughly 2 years of HS equivalent. Dividing by 2 for 4 weeks equals roughly 1 year of HS study. However, much depends upon the student’s willingness and dedication. And almost every school will still require some type of a challenge exam upon return for any non-sponsored program. Bottom line, that’s a lot of money for jumping out of French 2. Personally, if I (or my parents) had that much available money to spend, I’d rather use it for immersion abroad after having achieved a higher level that HS French 1.