Do some old games! It's so much fun just to try and recreate some classics like Tic-Tac-Toe, Lunar Lander or Kalaha, and more educational than most textbooks. You'll also pick up some good math skills and variable understanding when you design an opponent, you play against.
Also, buy some good textbooks that are physical. They are often better than the internet, because you'll be focused more when you read them, than when you are surfing(otherwise, you'll watch a movie, listen to an album, receive private messages, torrenting, cracking and PM'ing etc., all distracting you).
Do some old games! It's so much fun just to try and recreate some classics like Tic-Tac-Toe, Lunar Lander or Kalaha, and more educational than most textbooks. You'll also pick up some good math skills and variable understanding when you design an opponent, you play against.
Also, buy some good textbooks that are physical. They are often better than the internet, because you'll be focused more when you read them, than when you are surfing(otherwise, you'll watch a movie, listen to an album, receive private messages, torrenting, cracking and PM'ing etc., all distracting you).