اللِّهُم انّفَعنِي بِمَا عَلَّمتَنِي وَ عَلِّمنِيِ مَا يَنفَعنِي
Allahumma infa’nii bimaa ‘allamtanii wa’allimnii maa yanfa’ unii
O Allah! Make useful for me what You taught me and teach me knowledge that will be useful to me.
O Allah! Make useful for me what You taught me
O Allah! Make useful for me what You taught me and teach me knowledge that will be useful to me.
Daily Dua'a 
I think this du’a is good for everybody in perticular to our youngesters who are deciding to take a perticular field as their profession.
Assalamwalaykum .
In this dua the word allimnii is correct or allamnii is correct… please help…
allimnii is the correct way (means teach me); allamnii would mean taught me