I read about this somewhere. This is all I could find on the Internet. If I see any more, I'll post it.
Each team consists of four pupils of different ages: one from year 7-9, one from year 10-11, one from year 12 and one from year 13. There are 7 different timed rounds with each round testing a different area of the maths course covered by the team members. There are, for example, questions on geometry, algebra, calculus and mental arithmetic. Most questions have a 30-60 second time limit. There is also a team round, where each team has five minutes to solve a longer problem with a key task being the delegation of different parts of the problem to the individual team members. The competition culminates with a race round where for each question only the fastest school to answer gets the points.
A few of the questions answered varied from expressing numbers as sums of powers of 2 and 3, e.g. 145 = 64 + 81 = 2^6 + 3^4 to working out ff(x) where f(x)=(2x+1)(2x-1).
Another one: Find three consecutive integers such :
The smaller is divisible by 7
The next is divisible by 11
And the third is divisible by 5