You can't really trust the people who grade and evaluate your mock exams since they all have maximising profits in mind and it would be unwise of them to fail someone who has paid them hundreds and thousand of dollars for a few hours long mock exam.
I believe the best way to improve your SEP component is to constantly speak in English in the days and weeks prior to your exam and also watch CNN America or any other American news show because those reporters have their emotions, punctuations and pronunciations on point. You should also train your mind to think in English and not in any other language because that'll make it more effortless for you to convey what you're thinking to the patient.