Do online personality evaluation then check myers briggs for compatible career. Then go for education expo and talk to counsellors about possible courses. I wouldnt recommend jumping into a uni unless specific reason.

For engineering, engineering maths are harder than add maths and maths at school, so if you think maths and add maths is something you can deal with it, with enough efforts, you can deal  with engineering maths as well. For engineering, you have to score the science subjects as well (Physics, Chemistry)(Bio if you want to take biomedical engineering) because what you learned in high school will be used in engineering.

2. If you deal with Arab language, you can consider IIUM. AFAIK, my friends from IIUM foundation said that Arab language is compulsory. For on-campus accommodation, I think UTM also have on-campus accommodation (correct me if i'm wrong), but for other universities, you can choose options to make sure you can stay in college, from getting involved in college's activites, become athlete for the university, making sure the college's warden knows you and many more. But for me, your future maybe be brighter if you join these activites to sharpen your soft skills instead of staying years in college without doing nothing.

That is all from me then.
P.S. - once again, this is only my thought, if anyone have other way of thinking, feel free to continue your way of thinking. I'm open to it.

I'll address your first issue. Since you do like maths but at the same time, need a career path that would satisfy your mother in terms of prospect and salary - i would recommend that you consider Actuarial Science. Do go around asking about what it is and what it entails. It may satisfy the maths in you and the career pathway as well.

First find out what programme you want to do and then find out which is the best university to offer it. Don't do it the other way round.