Don't worry about circuits or not. Your instructor has a lesson plan and knows when it is time for circuits and time for other things. (Or at least, he or she is supposed to have a plan.)
What's more important is to understand that a lot of lessons will be cancelled due to weather, and this is mostly so in autumn and spring. In winter, the weather is at the very least far more predictable so you know well in advance when a lesson is on or not.
If you want to progress faster, you've got to schedule more lessons (of which the same percentage will get cancelled) or be prepared to have a lesson at last minute notice. So plan two or three lessons each saturday, one in the morning, one in the afternoon. Chances are that one of them gets cancelled due to the weather, but the other will be on. Or look at the weather each morning as you go to work. If the weather looks good, call the school, book a lesson for late afternoon/early evening (while it is still light).
To have a fixed booking of, say, every saturday at 2pm will mean a lot of frustration. Whereas, if you are more flexible, it will allow far more flying to be done.