Difficulty on the KAPLAN 2016 tests

Hello, I am into my 3rd week of preparation now and have given 2 Kaplan 2016 premier tests along with 2 GMATPrep 2016 tests. My scoring for the same has been as follows: KAPLAN Test 3: 610 GMATPrep Test 1: 540 GMATPrep Test 2: 590 KAPLAN Test 5: 660 My question is are the KAPLAN Tests designed to be...