Ok so a few days ago I posted this

Now comes the part where I call her to ask her out. My plan is to call her sunday at around 8 pm (lmk if there's a better" time to do this) and ask her how her trip home was. Then I'm going to ask her if she has any exams coming up (to gauge how free she is, although we are both in a class that has an exam coming up this wednesday). If she expresses that she doesn't, I'm going to ask to her come over to my place to watch a movie. If she says she does have exams coming up, should I ask "when are you free?" I don't want to look desperate. How do you guys set up a date if a girl says she's busy on every day you offer? (she hasn't done this yet, just wondering) Do you ask when she's free and then lose the power, or do you just wait?

The exceptionally tricky part of this whole ordeal is that she relies on me for test banks for the class we're in. She usually asks me for them around this time before the exam so I have to move fast.

Thanks

TL;DR

What's the right way to set up a date with a busy girl that both fits into her schedule, but also doesn't make you look like you're bending your will to hang out with her?