Good choice, buying wizlab's
wizlab's question are really tough than the real exam questions. you will fill comfortable in the real exam if you have gone though this mock tests.I also bought the same mock
test during my preparation.and honestly saying, i never scored more than 75 percent on the mock tests.
thats why i thought that i will get the same result in the real test too .but after seeing the actual test questions i felt those are not so difficult as the mock tests.but they were tricky some how and i got 91% ..
so if you are getting 75 to 80 % in these tests then don't panic you will definitely get a good score in the real exam.