An exercise to practice telepathy for beginners:

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Take five different colors of pen or any other small objects of different colors, choose a friend or person for the practice (without his knowledge). first try to feel that person's emotions, if you get a light sensation it means that you are in contact with the person, you can also imagine observing brain waves of the person into your mind (this will make you better performer).

Now ask the person to choose a pen without informing you or picking the pen. try to read his mind and write the color which the person has chosen (of the pen) in a paper (without informing the person)

Now ask the person to pick the same pen and then show him/her the paper.

Practice is required to generate hundred percent accuracy.