How reliable are the Todaii JLPT mock tests?

I'm finishing the tests with 45 minutes left and I still pass. I have a feeling something isn't quite right.

I read fast, so that may help, but I don't think it's actually possible to finish with 45 minutes left.

It's for the JLPT N2.

Edit: just to clarify, I selected and completed listening, vocab, reading, and grammar in this time. Nothing was skipped.