To get a copy of your high school transcript, contact the registrar’s office at the school you graduated from. They should be able to get you a copy of your transcript. If you have difficulty getting your request filled by the school, you can try an on-line service like www.needmytranscriptcom.
For GED certificate, visit the Texas Certificate/Transcript Search to obtain a printable PDF containing the Certificate of High School Equivalency and test scores for $5. The printable PDF will include a diploma-style certificate suitable for framing and a transcript with test dates and scores. The certificates and verifications must be printed during this transaction, so be sure to use a computer that is connected to a printer.