Using guesswork and speculation in one's life
Q: Is guesswork and speculation considered kufr if one doesn't claim knowledge of the unseen?
Examples:
1. A call comes to the phone, I haven't looked at it, and I speculate it's surely x person with very much confidence and it turns out to be them. And I say "look I knew it"(meaning I am so smart that I guessed it correctly not claiming knowing unseen).
2. In multiple choice type questions choosing any of the answers blindly. Hoping you'd be correct. You don't know the correct answer and you choosing the answer was blind. Like betting.
3. Someone asks you to guess what's in their hand and you guess.
4. Saying a particular fictional story would probably end like the person is expecting.
In short, is speculation and guesswork in which you have strong confidence that you are right and the one in which you don't have it. Is it considered kufr?