There are more exams available, like the 6 on the REA book
But. I think that a very good thing is to find new ways to solve the same problem. Finally you are likely to find shortcuts that will help you in different problems. Or woek with other people. Read different ways people solved the problems. There are lots of versions of them.
ie: there is a question about a tangent plane in the 0568. I used the formula
fx(x-xo) + fy(x-yo) + fz(z-zo), where (xo,yo,zo) is the point of tangency
Although this wasn't a hard method, a coworker (I aam a Math tutor) said: I chaeted! Only this plane contains the point the point (xo,yo,zo). He was right, of coirse. And I don't think that he cheated at all!