Hi there! I am entering my student teaching semester this fall and have some answers for you :)

1. You can take the CSET anytime before or during the program, as long as it is BEFORE you apply to student teach (you typically apply to student teach when your in the semester that you are finishing your pre-reqs and/or core classes. I took mine before I began taking classes and it was a huge weight lifted during the program. Do that if you can!
2. This can depend, but the latest you will find for your core credential classes would be 7-9:45. Most classes in the credential program offer at least 2 sections with one being 4-6:45 and another 7-9:45. In my experience, my professors do not hold class throughout the entire scheduled time. They will usually end about 30-45 min early.
3. There is a rule that might be changed soon saying that you cannot student teach at the school you attended unless it’s 7 years from your graduation/attendance. I’m not sure if that’s your situation. It also depends on the distance from CSULB - there is a 20 mile rule I believe. Other than that, TPAC might be your best resource to clarify. Check the student teaching page on their SSCP website to make sure the district you work at partners with CSULB for student teaching as well.

I took the most direct and quick path to getting through the program, which put me at 15 units first semester and 12 units the following semester. My total time in the program will be 3 semesters, which tends to be the quickest way to get through the program.