Most people here wouldn't have the experience in the region you're coming from therefore it is difficult to help or guide you. Perhaps it would be worth wile to approach your questions from a different angle - I think you need to figure out which are those countries where you would be able to get a work permit/visa and then work your way through that - figure out what potential airlines can you approach - and from there on - what licences do they require (FAA/EASA or local?), what type of cadets are they looking for and so on?
That will answer good bit of your questions... there's no point for you to go to USA, if no one in, for example, India will look at FAA licences... Likewise what's the point in going for whatever it is they issue in UAE if it's not accepted in the States where you might be eligible to work if you're a citizen/dual citizen there? We don't know your circumstances
any reputable integrated school have admission tests where your math/physics skills might be tested. If you are completely clueless, you might not be accepted in one. Bristol Groundschool have a math/physics prep module, see if you can buy that and go through the exercises, it should help you to asses yourself and refresh your knowledge.. it's really not that hard