I can say that the test drive just has prompts but really you can do whatever you want and I don't think it would be a problem.

Roxas and Sora will have an idea of who she is, but more in the sense of being told about her rather than any actual memories. Roxas knows that they were friends and both in the Organization, but that's the extent of it really. Namine probably has the most information.

Thanks for taking an interest! I'll be sure to hit you up!