Astro

I’m a freshman aiming for QLab as my research lab and I will take AP Physics C junior year, I heard QLab is very selective so I want to do Astro if I don’t make QLab. I would have to take at least a semester of Astro (either solar system or universe) and I’m planning on taking concrete math for one period which is a semester, is it possible I could pair concrete for semester 1 with Astro universe for semester 2 in the same block? Idk if they allow pairing different subject semester courses with each other hence why I ask