Explinatioon of "By" vs "Through"


She managed to pass the exam ___ hard work and dedication.
Could you lend a hand?

Hello! She managed to pass the exam through hard work and dedication.
"Through" is used here because it indicates the means or method by which she passed the exam.
By refers to the method or agent (e.g., "by train" or "by John").
Through suggests a process or movement (e.g., "through practice" or "through the park").
Hope this helps!