Is it possible to skip straight to Grade 5 Theory? Will be skipping to Grade 5 piano, and would like to continue to Grade 6 Piano.
I imagine it's what a lot of folk do. I certainly did - take grade V theory as a passport to practical VI+. It's obvious that knowledge of the previous grades' content will be more than a bit important though.
It may well be dependent on the board used. In U.K. all of the exam boards require a grade V theory pass before continuing with practical above grade V, but it may not be so in other parts of the world and other boards.
You can do that. It is not required of you to do grades from initial level up to grade 8 level, but in most cases it would be beneficial to you to do all the grades to equip yourself for the next grade. I have done grades 1 & 2 theory, years ago. I can't remember which grade I stopped at but I am continuing from next year with grades 4,5 and then 6 and perhaps up to grade 7 maybe, but I think if you go through Trinity College of London there is a entry level of grade three at least. Perhaps read the website and see what they say.
Sure. I think you can even skip straight to Grade VIII theory if you want. There's a Grade V theory requirement for higher-grade practical exams, but none for theory exams AFAIK.