وَفَّقَكَ الله to a male
وفَّقَكِ الله to a female
We say this phrase to someone who is having an exam, or when you say goodbye to someone who is going to work, etc.
Our best wishes to all learners of the Arabic language
وَفَّقَكُمْ اللهُ في تَعَلُّمِ اللُّغَةَ الْعَرَبِيَّةِ.
May Allah grant all of you success in your learning of the Arabic language