I am good in maths but not really good in physics and chemistry! Now I am planning to study engineering in Canada or New Zealand but I am not quite sure which discipline will be best for me. Someone told me that Mechanical engineering is a good choice for me and besides oil and gas caught my attention. I am interested in Engineering Management too. If I do major in mechanical engineering and minor in petroleum and business/management, will it be good for me? I want to know about the future of this and obviously need to know about the salary. If you have any suggestion for me please tell me. Is there any other discipline better than this?and which country will be best for me between Canada and New Zealand? Thanks in advance 
The salary I think depend on country where you want work. Also, Canada and New Zealand both good countries and schools. But it depend on your budget. But I think I like Canada because more options of places to visit during vacation.
About physics and chemistry you can have tutors for the subject. Or you can ask help from experts until you learn. This where I ask help. They very helping to me: http://■■■■■■/ck0SNE