Hey SnekiSnek,
You will be fine! I have done the same thing this year and my success in the subject has not been affected. In saying that, I have been studying Literature and Ancient History for a few years before starting classics, and both courses are very linked. I was surprised how ‘Englishy’ classics was - you need to write eloquently and notice textual/artistic intricacies and techniques to take those top marks. It’s such a wonderful and enriching course whether you are striving for top marks or not - it really changes your perceptions of humanity and contextualises the modern age.
In regards to studying with VSV, I wholeheartedly recommend it. However, it is a lot of reading. Remember, the virtual teacher has to type everything that a classroom teacher would normally say to you across the course of a week, so there is a lot to read! But, every week’s work is sectioned very clearly, and the course notes are conversational. But, it is very important to write your own detailed notes and summaries based on VSV’s notes. Don’t read idly because you will not retain anything - understand the content and ideas and write it in your own terms. The SACs are fair and engaging, and nothing to stress about. And, yes, you are correct - the focus at the virtual school is definitely on Greece. All of my texts were Greek (The Iliad, Electra and Antigone, Greek vases, and The Histories and The Persians), but it made it a far simpler course sticking with the one society - everything was linked by the end.
In summary, go for it! Classics at VSV is a flourishing course with wonderful teachers, and worthwhile for any student to undertake. Best of luck!