How do I read the board in the teachers' office??

Here are some examples of how schedule changes are often written! For more details and a comprehensive glossary, take a look at the attached Word doc.

Some examples of how schedule changes are written:

10月11日(火) October 11 (Tuesday)
金の授業  Friday’s classes
   
10月11日 (火) October 11 (Tuesday)
45分ⅹ6P+30分 Six 45-minute periods, plus one 30-minute period
   
10月11日 (火) October 11 (Tuesday)
45分ⅹ6P 45-minute periods.
6P 「金1」 6th period is changed to Friday’s 1st period
   
10月11日 (火) October 11 (Tuesday)
45分x4P+50分x2P Four 45-minute periods and then two 50-minute periods
   
10月11日 (火) October 11 (Tuesday)
1年     月231645 1st years have Monday’s classes in the order of 2, 3, 1, 6, 4, 5.
2,3年 月234516 2nd and 3rd years have Monday’s classes in the order 2, 3, 4, 5, 1, 6
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