Question

“First, I went to the wrong classroom for math." What purpose does this sentence serve in the paragraph

Answer 1

This is showing that this is the First problem that was gonna happen out of a list with the Transition word being First. After this, it would be an example like.

Next Jack spilled orange juice on me at lunch.

Answer 2

The sentence is stating what the person did first in the list of all the things he/she did in the rest of the paragraph.

See in the sentence how it says, “First, I went to the wrong classroom for math."