What Duolingo score do you need for Drexel University?

For engineering master's programmes, the English test requirement is waived if you graduated from a US institution of higher education. The undergraduate page says applicants whose first language is not English may be asked to submit a proficiency exam, and lists exemptions such as English as your first language.

IELTS comparison: the engineering guidelines and the CCI page both ask for IELTS 6.5.

Engineering applicants below the department's language requirement who meet everything else may be accepted with a recommendation to complete a bridge programme. Drexel's English Language Center runs the five-week Graduate Preparation Program (Grad Prep), which starts the summer before your master's; apply through the standard application by 15 April.

Requirements vary by programme and change between admissions cycles. The score that binds you is the one on your Drexel programme page and in your offer letter, so check it there before you book a test.