I'm trying to talk to this girl in my class who's cute,

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I'm trying to talk to this girl in my class who's cute, and I honestly don't want to turn her off from me, so I wanna know how obvious it is I like her somewhat if I sit next to her/talk to her before class when she's alone?

I'm not even sure what her name is to be quite honest, we've talked like 10 minutes at most waiting outside a class after an exam cause I asked her a question.

If it's any help since maybe the chance it's weird might be situation specific, this is how it went -

I spoke to her (A) and her friend (B) after the exam, before our next class. I asked what they got for a problem I didn't get, and A and B both told me that was hard for them, and A was super quick to actually answer. Her body language was pretty open and she smiled the entire time, didn't seem annoyed/bored, but B did at some point. We talked a bit more about studying, exam stress etc. I was about to ask for her name, but a friend came by and talked to A on the side and B was barely interested in the conversation at all, so it ended up I just said by to B as A was walking in the door quickly.

I caught a quick glance in my direction in the class, and that was about it. The next class I had with them was Thursday, and I didn't bother speaking to A since she was in a group with 3 other friends (B included). I sat like near them though, and they walked out of class earlier than I did, and I could swear A looked at me as she walked up the aisle to leave and flashed a smile or something. I'm not too sure though, I could be making this up in my head since I tend to romanticize what happened to fit my own narrative. I'm positive she was looking directly at me though.

If I talk to her Monday when we both have class again, should I do it no matter what, or only if she's alone or with B? How should I start it off, "Thanks for the help last week after the exam, do you guys get what's going on from last lecture?" and go from there? And how obvious would it be I like her somewhat?