I read this book maybe 10 years ago. I'll try and piece as much of it as I can below:
- Protagonist is a male school student.
- He is approached by someone and requested to go with them to the future where the (president/prime minister?) has cloned himself and abusing his power.
- In this future, there is a device that people can use to learn skills instantly (a helmet, with various skill cards if I remember correctly)? The protagonist uses this to learn how to swim, as the future character's identity he is assuming can swim well.
- Whilst he has this device, he comes across a (Jedi mind powers?) card that is mentioned to be unsafe/unpredictable, but he uses it anyway.