all i can think of is try it on a bathroom scale, but i dont think it would work too well. just keep on building up strength in your hands, you really shouldnt fail it, it is quite a low number. so unless you have poor hand strength, i wouldnt be really worried. all i can say is prep for the physical fitness test the best you can. work on the proper push up form (check recruiter for information on how to do it), and also on running, those are the big things that get people. and the other stuff train normally, unless you feel like you need to pay particular attention to a certain part of the testing.