السلام عليكم ورحمة الله وبركاته Jummah for me starts at 12:15, and my school break finishes at 12:45. So far ive always arrived late at school. There are consequences if i arrive late too many times. What should i do in this position?

Look for a masjid whose khutbah finishes earlier, and explain your situation to the school, rather than dropping the Jumuah. Also, explain your situation to the masjid, maybe they can accommodate students by shorter khutbas or starting earlier.