As for your "prediction" for your summer school teacher, that could have been a number of things. It might have been just a really good guess, or you might have some natural gifts in ESP, or you could have actually used a chart effectively. I have known many astrologers through the years my mother charted and taught, however the subject of faith was not a componant part of their process.
There are a number of interpretive schools in astrology. I have seen things that were similar to your esperience.
Ever hear of 3 sigma?
It took me years to learn that lesson and understand why I was able to "see" things.
Today, I fully realize that the Stars do not control our life in any way. They never did, and never will.
I offered a single example about a summer school teacher almost 30 years ago. Actually, she was important for a rather simple reason. She was the last person I performed a detailed horoscope for. After that date, I was properly educated in the rules of science.