Finally…. I cleared n=3 with only 2 misses and 12 hits and reached n=4. Now I can remember a series of even 4 white blocks and 4 letters, which is a proof of my increased memory power.
Since when I have started taking this Brain Fitness Training, I realized that I have started stressing my mind more than earlier. Stressing not in negative way, it means applying my brains more, on any particular task and that too with increased level of concentration.