Based on the time and the day, this program will automatically calculate the Zoom class you have and join it when run.

For more convenience, I suggest going to the program in the Shortcuts app and selecting

Share ▶︎ Add to Home Screen ▶︎ Add

If your device won’t let you install the program, you probably have Allow Untrusted Shortcuts off. To turn it on, go to

Settings ▶︎ Shortcuts ▶︎ Allow Untrusted Shortcuts ▶︎ ON