* If you are currently in high school: Your high school guidance counselor or registrar is the best resource. They maintain official records of your earned credits. You can also usually access this information online through your school's student portal or information system.
* If you have already graduated high school: Your high school likely still has your transcript. You can request a copy of your official transcript from your high school. Many schools offer online transcript requests. Check your school's website for instructions. You may need to pay a small fee.
* If you have college transcripts: Your college transcripts should list the high school credits you transferred, though it might not give a total number of credits earned in high school. This is only partially helpful.
* If you have no official records: If you can't locate your records and have no way to contact your high school, reconstructing the number of credits will be very difficult. You'd need to manually count courses taken, and even then you might not be accurate. The best approach would be to contact your high school and attempt to obtain a transcript.
In short, always start by contacting your high school's guidance counselor or registrar's office. They are the keepers of the official record of your high school credits.