The GLC follows the in-house curriculum as well as the Common European framework for languages:

Exams offered by the GLC:

Deutsches Sprachdiplom (DSD) I:  grades   8 - 10
Deutsches Sprachdiplom (DSD) II: grades 10 - 12

AATG*, National High School exams: Levels 2 - 4
*American Association of teachers of German

Information about the DSD can be found at:
http://www.auslandsschulwesen.de/cln_100/nn_2176922/Auslandsschulwesen/Auslandsschularbeit/DSD/node.html?__nnn=true (available in German only)

Exam dates for the 2022-2023 school year:

AATG National High School Exams: January 21, 2023
(AATG = American Association of Teachers of German)

DSD I (A2/B1), written exams: March 9, 2023
DSD I (A2/B1), oral exams: March 11, 2023
(DSD I = Deutsches Sprachdiplom Stufe 1/German Language Diploma Level 1)

DSD II (B2/C1), written exams: November 22, 2022
DSD II (B2/C1), oral exams: January 7, 2023
(DSD II = Deutsches Sprachdiplom Stufe 2/ German Language Diploma Level 2)

ZfA-Presentation contest: tba 
(ZfA = Zentralstelle für das Auslandsschulwesen)