Role of which tablet. To grow memory power and mental health reasoning power you have certain brain foods and exercises that you can google which helps improve the same. Thirdly, to make sure we perceive positive things, concentrate on good things in your life and on each step note down the positive things that happen to you and focus on them, simultaneously this will help your mind true in that direction. I don't know about the courses but there are certain mobile apps (peak, neuronation)  that claim to improve the memory power as they have certain brain games that calculate your mental capacities and will show you your daily improvement which can help you keep a track of the same as well as improve them.