Physics labs will be different this school year. M---- corresponds to A1, -T--- corresponds to B1, --W-- corresponds to A2, and ---R- corresponds to B2.
Physics lab cycles will be different from Biology and Chemistry lab cycles. A sample 5-day week for Physics might look like A1-B1-A2-B2-A1, where students with A1 labs will meet twice. The following week will be B1-A2-B2-A1-B1, where students with B1 labs will meet twice.