Girl and I have been school 'friends' when we both had a relationship. Now we are both out of a relationship and I want to game her.

We have never done anything out of school, so my question is: is it worth it to try and if so, would being direct be the way or more subtle?

She messaged me that she didn't know how her test went, so would it be wise to say:

"If you passed the test, I will take you out for coffee. If I pass the test, you will take me out for coffee :)"

Or something more/less direct?

Thanks in advance! :)