positive

[Offroad]

Please, dear teachers and friends,

I would like to know how to use "positive" when it's related to overconfidence, someone who faces something as a dogma.

So, are these sentences below readible?

Are you positive about that?
He is positive that he will beat of his defiants.
How positive are they about such results?
As she studies Math she gets more positive to pass the exam!

Thanks

[susiedqq]

Positive means "sure" in these statements:

Are you positive about that?
He is positive that he will beat of his defiants.
How positive are they about such results?



As she studies Math she gets more positive to pass the exam!
The more she studies math, the more positive she feels about the exam.

[Offroad]

As she studies Math she gets more positive to pass the exam!
The more she studies math, the more positive she feels about the exam.

So, isn't the sentence gramatically fine?

Thanks