Lectures and labs on the same day as an exam?
The university I'm at recently had a class with lecture in the morning, lab that afternoon, exam an hour after that, then a quiz the following morning in lecture, and finally a recitation that afternoon. Summer semesters tend to be like this as they are shorter in length than a fall or spring semester. No one is happy with it, but it's what needs to happen to cover all the requisite material.

What would typically happen during a regular semester is that labs can't be moved or adjusted, but usually the following lecture is either shorter of cancelled if it is the next day and the lecture the day of the exam is mostly review. But I must point out it is at the discretion of the professor.