I'm aiming to become a Pupil before the next ICPC season, and I'm looking for advice from those who have already achieved it.

• What should I practice?
• Which topics deserve the most focus?
• Is Codeforces enough, or should I use AtCoder/CSES as well?
• How should I balance individual practice and team preparation?
• What common mistakes should I avoid?

I'd really appreciate any tips, strategies, or personal experiences. Thanks in advance!