I had my first job interview and need advice PLeASE HELP!?

I had my first interview and applied for two open positions. I got a call back 10 hours after I applied so I thought that was great. I went to my interview Wednesday 13th I got a wonderful sweet interviewer who said I did great and answered all questions perfectly. They also have everyone take a math test before the interview in-which she stated I did excellent on and did not miss any. Then as we were talking she started naming positions that were available that was not on the application choice in the HR department. She stated I needed to pick but it was hard as this was my first interview and all the positions were available and starting asap. So then she told me to hold on and went to speak with her supervisor. She came back and to me to apply for ESO in the HR department but it would require an additional test. I said okay and proceeded with the test in which I know I passed. I was there for two hours and no one else took this second test and no one else was there as long as I was. By the time I finished the test she had to leave and every one else left except the Supervisor and his assistant. I turned in my test and the assistant said someone will grade it and call me back but it is now Saturday and I am anxious to find out something. I have never have a job so I am unsure of the proper procedures and how long it takes to get a call back or if I should call. I tried reading other peoples questions that were similar to mines but everyone seems to have their own options of calling or not to call. I also wondering do I have a good chance because the interviewer suggested a different position which is more higher qualifying and better opportunity? Also if they decide not to choose me for any reason can I still choose the position I originally applied for without having to do everything all over again? I would really appreciate Antone'ss (decent) comments that can ease my nerves and help me with my plans. Thanks in advance