Avoid being a dependent learner - squeeze the best out of every learning opportunity. Be competitive without being selfish. Take confidence in yourself without being smug. Be assertive not uncouth and aggressive. Success isn't easy.
Hard work comes with the territory.
Success in school requires studying-lots of it. Though you may find studying a chore, the reality is that it's great satisfaction in mastering a subject area. So, it all comes down to motivating yourself. For some, no pain, no gain. Development of effective study skills is absolutely essential to success in high school and college.