This is a pretty significant violation in my mind. Having an OW student do FOUR dives in a day - in cold water no less - presents multiple safety issues.
To OP, congratulations on your cert, but as you're hearing, you didn't get it in optimal form. Because of your lack of experience, the safety violations may not feel that pressing for you. What you might be able to appreciate in any event, however, is how this accelerated schedule would likely detract from your ability to retain what you were shown and what you practiced.
First, you were in cold water and you're not used to multiple dives at all, so I'd have to think you were quite tired by the end of the day. Tired brains can't retain nearly as much as well-rested ones. There are undoubtedly parts of the experience you won't remember at all, and others that you remember, but inadequately.
Second, the brain can only take in so much new information at once. After that, it's like the saturated sponge that won't absorb any more water no matter how long you keep pouring more on. You must have run through a ton of different drills in rapid succession, not having enough time to process what you'd done before the next one was coming at you. The brain has no choice but to abandon the half-learned thing it was still working on in favor of the new thing that's in front of it right now. The previous item never gets fully processed. Then the second item gets abandoned partway through processing in favor of the third that has now arrived, and so on.
Any of us have to do LOTS of review and practice after OW in order to really internalize the information and develop the muscle memory that results in actual knowledge and skill. I suspect you'll need it even more, because too much went by you too fast, and in conditions that would only make it harder to keep up.