I want to transcend my dad, but due to my inability to stay focus in school I can't.
Did I use the word transcend properly?
No, you did not use the word "transcend" correctly in your sentence. "Transcend" means to go beyond the usual limits or surpass something, usually in a spiritual or abstract manner. It does not apply to wanting to surpass or excel someone, such as your dad.
You might consider using a different word or phrase to convey your desire to outperform or exceed your dad in a certain area, such as "outshine," "outperform," or "excel."