Just like shariat is the orders of Allah,Taqdeer is the work of Allah swt.We all have to bow down to it,wether it is a commoner like me or a shaikh like him.Whatever is written in our destiny will reach us,no matter what !There are remedies,which you have rightly mentioned.Just like in physical disease,taking precautionary measures does not mean that a disease will never occur,neither can we say that all the treatement will always cure a disease,Taqdeer will always find us.We all shall ask for afia....and then should adop tafweez for whatever comes our way.After all we are in examination hall,there will difficult questions and there may be easy ones too.For difficult times we are advised to do Sabr,for easy times there is shukur....and.....wal aqebato lil muttaqeen !