Congratulations on your results! That is a very strong showing, and puts you in good stead to find a way into a good university.
I am now starting 3rd year of the Scots Law LL.B. at the University of Glasgow. However, when I first applied for the course I was in a similar position to yourself - in fact, my position was significantly worse: I took 3 Highers at college in 2019 and finished 5th year with AAC in English, Maths and History.
Instead of relying on Highers (which would have been unsuccessful), I managed to get a place on the University of Glasgow Access Course, where I studied Law and Economics part-time for a year. This put me on a streamlined process, where I was virtually guaranteed a place on the Scots Law degree at Glasgow as long as I performed well in their Access Course, which I managed to do. (A decent LNAT score is also necessary, but not too difficult.) Basically, instead of doing 6th-year, I did an Access course at the University itself, which got me a place on the law degree. I believe having this kind of direct in-house preparation has also helped me perform well on the degree itself.
In any case, it's probably a bit early for you to be worrying about these sorts of options just yet. I would just focus on getting as many good Highers as possible for now (especially English), and see where you stand after 5th year. However, it's definitely worth keeping these alterative options in mind if you find yourself a bit short. You will definitely be smart enough to do well on an Access Course, or take a HNC/HND in Legal Studies at college, to secure entry to a top Scottish university. Either way, you'll be fine. Even if you have to take an extra year (which is unlikely anyway), that really doesn't matter in the slightest; loads of people do it. And once you're in uni, nobody really cares how you got there.