Du'aa

salam could kindly please give a dua or sunnah that i can sucessfully pass my gcse exams. i want to pass my exams so i can make my mum proud. Also  my dad passed away in october in ramadhan whereas on the night of power he was coming back from the mosque and suddenly because of a heart attack he fell on his knees and like as if he was bowing down with his head on the ground and his hat came off in front of him. i miss my dad and hope he goes to jannah because he was a very good muslim, please could you tell me a dua that can cure my brother as he has a very weak mind caused by his illness. thank you  

I suffer from sleep deprivation. Could you suggest any Du`aafor me to over come insomnia?

My cousins accused my brothers of something that they have not done it.  They are not in jail.  What prayers should I perfom to make our difficulties ease and relieve them from such misery.   

assalamu alaykum wa rahmat Allah wa barakatuh... may Allah azza wa jal reward all of you for this service ameen... my question is : are we allowed to say inshaa Allah in our du'aas ? or not ? i am so used to say inshaa Allah after each sentence that i have observed myself saying it in my du'aas after prayers.. ( for example.. ya Allah... inshaa Allah you will keep on protecting and blessing me and my family...) i realized it was somehow not right.. since i am talking directly to Allah azza wa jal in my du'aas but i wanted to have a right answer to it inshaa Allah... jazakum Allahu khayran... fi aman Allah.. wa salam