I got this info from a friend hope it helps you.
you can also see this SHL link below
http://www.shl.com/SHL/en-int/Products
it all depends on your field. there are 3 tests which are common irresepective of discipline. These are Numerical reasoning, verbal reasoning both in SHL format and abstract reasoning which just consists of shapes and patterns being repeated. the 4th test will be from your engineering field. this last one is the toughest of all cos u will need all the knowledge you can remember form your undergraduate days.