Not recommended. Even though you might actually benefit from it but the order in which you do the questions is actually important. The questions are sorted depending upon their level of difficulty to get your self used to the exam so that you may feel comfortable doing the questions as you go. You don't want to see application of calculus to the physical world in number one. But again, it is up to any one's preference whether they want to actually start from the start or start from the finish line.
yeah i'm with budi tan with this one,i once tried it, but changed i my mind half way through. if you spend heaps of time with the hard ones, you'll be rushing to get the easy ones done. = SILLY ERRORS