Load your Section A classes from the school timetable sheet, and send classes, deadlines and plans to your Google Calendar (which your Samsung Calendar shows too).
Google sign-in isn't switched on for this site yet. It'll start working after the next update.
StatusAccounts
The emails only pick the right account in Google's sign-in window. Classes marked for both sections, and sessions without a section (like workshops), are included as well.
How it works
Class schedule: tap Connect and choose your school account. The site reads the sheet (read-only) and keeps your section's classes. It checks the sheet again every time you open the site, at most every 30 minutes.
Google Calendar: tap Connect and choose your Gmail. The site creates a calendar called Home Base and keeps it matched with your classes and everything in Assignments, Exams & Plans. If something is changed or deleted here, it changes in the calendar too.
Samsung Calendar: open Samsung Calendar → ☰ → Manage calendars, and make sure Home Base under your Gmail is switched on.
Google sign-ins last about an hour. When one runs out, the status above turns yellow. Tap Update or Sync to continue.
Disconnect
Signing out stops syncing. The Home Base calendar stays in your Google Calendar. You can delete it there if you no longer want it.