Display selected text from an entire table

So recently our college has shared a common timetable for all the classes, however, I want a timetable to be displayed only for the subjects that I has applied for. Can anyone help me with this? I am ready to share the timetable as well.

TIA!

Hello SyKick and Welcome to Excel Forum.
As you are using the 2019 version of Excel I would suggest using Get & Transform to unpivot the classes using the following Power Query advanced editor code:

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Note that the code also produces a 'Subject' column without the A1, B2 ... designations.
Once the row over row table is produced it may be referenced using a pivot table and the subjects for which you applied may be chosen using a slicer.
Let us know if you have any questions.