Hi, The origonal question has nothink to do with tuning your violin, which is done at grade 5. So i am not sure what you mean. Also, it is really difficult to tune a violin initially. I can remember trying for about an hour when i first got mine, then the teacher had to put it in tune properly!
It is perfectly possible and i have played a number of sight reading tests at grade 2 that go just our side the range given in the syllabus. As i explained before (which was explained to me by a professional violinst from the royal college of music) you are expected to know the notes on the fingerboard in first postion, and be able to read the music, also, these pieces are prepared. The sight reading is also prepared in the context that you practice the sight reading and learn the notes.
Also, as you progress, the music becomes increasingly more difficult, and i am sure that every single aspect of music playing is not mentioned in the syllabus. This, may sound a bit unfair, but i really do not think it isn't, when you think about it logically ----- you are expected to start thinking for yourself at an early stage perhaps. So one or two notes ouside the range is not mind blowingly difficult.
People who sit piano exams do not have to tune a piano in an exam at all ! ---- thank goodness. But this is not seen as unfair or make the piano easy to play.