Misty – here is the info from his website re: high school credit.
Is Visual Latin good for high school credit?
In terms of the material it covers, Visual Latin Latin 1 (Lessons 1-30) is good for one high school foreign language credit. By itself, however, it will not provide a full 150 hours of work. Some parents are less concerned about this, but others may want to provide extra supporting materials for upper level high school students. For those who do, we recommend supplementing Latin 1 with Lingua Latina per se Illustrata and Lingua Latina Exercita 1. (The older version of LL without color is the same text and perfectly acceptable.) We have created a free Visual Latin/Lingua Latina Teaching Guide that you can use to match them together over a two-year period. [Note that Lingua Latina is a unique Latin only, college-level book. Visual Latin has been modeled on this book, and in terms of content, teaches exactly the same things.]