Hello
regarding the assessment, its all pretty basic stuff.
the English test is very basic, if you are used to speaking in English then it shouldn't be a problem for you.
the math test is high school level, if you go through the topics given to you, it will be OK. none of the questions should be out of the ordinary.
physics too is at the high school level, I suggest you do a bit of brushing up if you have been out of touch with the subject, some of the questions to get a bit tricky.
a lot of candidates had gone to bright dimensions in deira, Dubai for a refresher course in math and physics. they train you with the alpha assessment test in mind. there are refresher courses conducted in alpha as well.
to be honest, even if you do find the assessment tests to be easy, don't let that fool you. The course is far from easy. it requires a lot of hard work.
cheers