I, on the other hand read this du'a when I encounter problems with anything I work with. Be it parking space or rebellious children or problems with life.... emotional, spiritual or otherwise.
I advise my children to use this du'a when encountering problems answering questions during examinations. It's something I want to inculcate in my children. When faced with any difficulty ...always turn to Allah swt. No matter how trivial.
My mum taught me this du'a. It is simple and repetitive.
رَبِّيْ يَسِّرْ وَلَا تُعَسِّرْ رَبِّيْ تَمِّمْ بِالْخَيْرِ
O Allah: Make things easier for me and don't make them difficult.
I found this other du'a from my Teacher. Most times, I read this du'a below. Simply because I like the way it sounds. And Mashaallah, it never fails ... inshaAllah.
اللهُمَّ لا سَهْلَ إلا مَا جَعَلتَهُ سَهْلا وَ أنتَ تَجْعَلُ الحزْنَ إذا شِئْتَ سَهْلا
Allahumma la sahla illa ma ja’altahu sahla, wa ‘anta taj-alul hazna idha shi’ta sahla
O Allah! There is nothing easy except what You make easy, and You make the difficult easy if it be Your Will.