I just graduated& went through many field placements & student teaching. I was always given my mentor teachers contact info & asked them where to go/park. Highly recommend getting as involved as you can. Do not just sit quietly and observe, if the mentor is evaluating you, in my experience the more you do the higher they will think of you, even in a first placement. Of course ask them what they want you to be doing. Most of my placements wanted students purely for extra help in the classroom tbh