I passed the step 1 SCEA 5 with 73%. Not the greatest of score but nonetheless I am happy with the result. If you must absolutely have a simulator Whizlabs is the way to go. I scored around mid 70% to mid 80% on its practice exams. Some of the questions on non-functional requirements were confusing. The best part of the simulator Security, Design Patterns and to get a feel for the exam. The 'grammar' part of the questions was a bit ordinary.