never looked into telekenisis [though sometimes i think really loud while staring at someone in hopes they can tell what i'm thinking lol] couple basic things you could do to strengthen your psychic skills would be to make prediction.
each day, before you leave for the day, concentration and try to make 3 predictions about your day. don't go with 'go to school' something like 'pop quiz in math' things that are a part of your routine don't really count as using your clairvoyant abilities. while meditating, or concentrating, you should see, hear, or feel something.
another thing you could try is take a deck of playing card and try to picture/feel what card it is. start simply with red or black, then move on to suit, face card or number, and finally the whole card.