I was with my highschool friends, they were studying for exams and i solved a few of their exam materials. And later i went for skiing.
Dreams about high school often symbolize lessons and teachings in life. Thus, your dream may suggest that you are experiencing a situation in your waking life where you feel confident in your abilities to help or guide others towards achieving their goals. The act of solving their exam materials may indicate that you are able to provide clarity and support to those around you.
As for the skiing part of your dream, it may suggest that you are feeling free and enjoying a period of recreation in your waking life. Skiing is typically associated with a sense of adventure and excitement, so this dream could be a reflection of your overall positive outlook and energy.