Prizes are awarded on the results of trials (internal exams), GCSE and AS-levels. In addition, many subjects and activities have specially endowed prizes, several of which are awarded by visiting experts. The most prestigious is the Newcastle Scholarship, awarded on the strength of an examination, consisting of two papers in philosophical theology, moral theory and applied ethics. Also of note are the Gladstone Memorial Prize and the Coutts Prize, awarded on the results of trials and AS-level examinations in C; and the Huxley Prize, awarded for a project on a scientific subject. Other specialist prizes include the Newcastle Classical Prize; the Rosebery Exhibition for History; the Queen’s Prizes for French and German; the Duke of Newcastle’s Russian Prize; the Beddington Spanish Prize; the Strafford and Bowman Shakespeare Prizes; the Tomline and Russell Prizes in Mathematics; the Sotheby Prize for History of Art; the Waddington Prize for Theology and Philosophy; the Birley Prize for History; The Lower Boy Rosebery Prize and the Wilder Prize for Theology. Prizes are awarded too for excellence in such activities as painting, sculpture, ceramics, playing musical instruments, musical composition, declamation, silverwork, and design.

Answer this question, if possible (if impossible, reply "unanswerable"): Are trials considered internal or external exams?
internal