Browsing Waterstones, just after Christmas, I came across The Mind Gym: Give Me Time, a self help book about which I'd seen an article in The Times some days previously. I ordered it from Amazon, together with its mate, the original Mind Gym: Wake Up Your Mind
Each book has a code inside, which allows access to the accompanying website, where the exercises and quizzes can be completed online and the results stored.
Very impressive, rather interesting and, I hope, ultimately useful in enabling me to make more effective use of my time.
More at The Mind Gym