My dad is pretty successful in business. Yet, when I ask him, he says me its Allah who gives everything ultimately. And that Satan causes himself to be too proud after a huge financial success, for which many financial failures follow. Once you lose connection with achievement (which is due to Satan), according to him, you will fail.
I did well in my O levels and other exams. I got many prizes, medals, and crests. Not a single time do I remember praying to Satan, instead of Allah.
I studied the Quran pretty well (the meaning). Not a single time do I remember it said Satan may help in worldly matters (let alone the hereafter!).
It all depends on what you WANT. Some people just want the hereafter, like the religious priests. They will not get much in this world, because they FOCUS on the hereafter. If you really WANT money, power and success (which is MUCH better than wanting success in hereafter or something else), and ask God for help with faith, he will certainly. My dad's words and experience is the strongest proof of this.
So, whether Allah helps you on worldly matters depends on what you really WANT and believe.