Hi Michael and a warm welcome to you.
I would suggest you start right at the beginning.
OK, you might find you know a lot of stuff and you can carry on forward quickly, but there will be hints and tips that, maybe, you've forgotten. A basic refresher doesn't do any harm at all.
Also, it sets the tone for the rest of the course.
The teachers are excellent and really know their stuff.
Starting from the beginning will also show how far along your abilities are. You might progress very quickly at the start, (depending on your ablities) but you will get to a point where you catch up to your present level and you can take it from there.
I think this approach will serve you well.
Joe.