Since the Colyton and Torquay tests are scheduled for the same day, is it not possible for children to sit for both?
Unfortunately I suspect not since, firstly, the dates clash and the Colyton website talks of "the test day" whereas TGGS and TBGS spread their tests over two consecutive Saturdays, CEM wk1 and English & Maths wk2 (i.e. every candidate attends for both days, not half one week and half the next). Secondly, TGGS and TBGS and Churston Ferrers collaboratively set and mark the English and Maths tests themselves, so I doubt that they are appropriate to Colyton.
It seems that the Torbay and Colyton tests are "different animals".