"Sounds like you might benefit from taking a break from circuits. Ask your instructor to move onto navigation for a lesson or two. You'll still get to have a go at landing at the end of the lesson, and it should give your brain the chance to recover from all the circuit bashing."
This is exactly what my instructor did with me and it worked. I did three dual navs (and the landings). Then when I came back to the circuit It all seemed to come together and I did my first solo quite soon thereafter.