Yep, I pretty much have been stuck at the same level the whole week. In fact, my current N is exactly the same as it was a week ago: 2.75. Possibly, it's because of fatigue; right now, twenty sessions per day is actually wiping me out. Or, it might be the stress of upcoming finals. Either way, I probably won't be able to do any training during finals (which start in a couple of days).
Or, it could just be that I fail hard at brain training in general.
Also, I promise that I'll return here at least once a week to update you, if nothing else, on the brain training.