The Calculation test is just basic arithmetic problems, no biggie there. The checking test is picking a matching sequence of letters/numbers out of several options, with a decreasing amount of time to find the correct sequence (that is, you get something like 8 or 9 seconds initially, and it gets down to like 3 or 4 seconds towards the end, don't panic if you start missing a few towards the end!). The talent screener is just some questions to answer, no study you can do for that, it's just about you
Good luck with the tests!