Dreaming of high school is a positive dream as per dream interpretation and meaning. Dream means you will meet people which will revive old memories. Dreams of high school are also a kind of warning about ill health or mental problems or loneliness. It is asking you to come out of it by being positive.
Dream of high school and you see your friends means they are well wishers and they might be asking you to be careful about something that is happening in your life. They also come to warn you against dangers.
Dreaming of high school and you are in the dream means it is time to correct the mistakes of the past. It is asking you to go back in life and apologize and mend things.
Dreaming of playing in high school means there will be happiness and change of luck in near future.
Always note that the dream should happen naturally and it should not be extension of what has happened on the day. Dreams that happen without any influence of the activities of daytime have great significance and meaning. Such dreams should not be ignored.