GCE A Level is divided into two parts: Advanced Subsidiary Level (AS Level) and Advanced Level. AS Level is typically studied during Year 12 and the exam is considered to be at a moderate difficulty level compared to the higher level exams. Students usually choose to study around 4 AS Level subjects, with the highest grade being an A and the lowest being an E. A passing grade in each subject will earn the student one credit. Completing and passing exams at the AS Level will only complete half of the GCE A Level curriculum.

Advanced Level (A Level) is typically studied during Year 13, and the exam content and difficulty level are much more challenging compared to the AS Level. Students that take the A Level curriculum will gain deeper knowledge in their chosen subjects. Typically, students choose to study only 3 A Level subjects, which are usually only those required for university entry. Grades for A Level coursework range from A* (the highest grade) down to E. A passing grade in each subject will earn the student two credits.

Once a student has successfully completed both AS Level and A Level coursework. They will have completed the GCE A Level curriculum. However, students can also choose to only take the A Level coursework if they wish.

There is a difference in how grades are awarded between AS Level and A Level exams. The highest grade achievable in AS Level exams is an A. However, in A Level exams, it is possible to achieve an A* grade. In addition to receiving a grade, both AS Level and A Level exams are marked using the Percentage Uniform Mark (PUM) system, which indicates how well a student performed in a particular subject. It’s important not to overlook this aspect of grading as it is a significant factor when completing the GCE A Level curriculum and receiving final grades.
 
GCE A Level exams offer over 50 subject options, including English, languages other than English, mathematics, sciences, humanities, technology, social sciences, art and general education. However, for Thailand, the number of subject options may be less than 50, as some subjects may not be available for Thai students to take. Nonetheless, there are still a variety of subject categories available for students to choose from. Regarding exam locations, students need not worry as the testing center will provide detailed information after registration is complete. Generally, exams are held at the Wave Place Building and the British Council, but the location may depend on the subject selected.