1. Play strategy and thinking games like chess and many more..
2. Try memorizing things with short-forms and symbols. It would make your brain faster and efficient in memory.
3. Be observant.
4. Play logical games and try solving Sudoku puzzles and crosswords.

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Play games on web.
Play game "say what i say" i.e. a person named ram should say "i am ram ,i like rocket" the next person for eg. sam should say "he is ram , he likes rocket and i am sam , i like sun" and so on(play with many members.