How did he get on with the PPL? Did he go over hours on that?
Has he done the CPL yet? How were the hours on that?
What are his intentions with the MEP? If it's to get an ME-IR then a lot of people put off the test, the requirement to start the IR portion is only to have completed the 6 hour course, a lot of people do the course, go on to the ME-IR, a lot of which is in the sim, then when they have done the IR test they do the MEP test and are much more proficient on the aircraft as they have flown it for at least 20 hours, and plenty of sim time too.
Some "old school" instructors do shout and scream. It doesn't work for everyone, but I'll admit that it worked for me as a student when I needed kicking into shape, and I'm a better pilot for it. A lot of the softly softly don't hurt your feelings stuff doesn't get results with everyone, some people do need a kick in the right direction. Having said that, you are the customer, and if the shouting method isn't getting the results perhaps it's time to try a different instructor/school.