Securing a spot through parallel admission into the Polytech network isn't decided by academic transcripts alone. The cover letter and the oral interview carry significant weight in the panel's decision, often as much as your grades. Here's how to prepare both.
Format and expectations of the Polytech motivation interview
The Polytech network brings together 15 public engineering schools attached to universities, and parallel admission (series DE3 for bac+2/+3, DE4 for bac+4 and above) goes through a common procedure centralized on the official Polytech network admissions site 🔗.
The interview usually lasts 15 to 20 minutes in front of a panel made up of academic staff and sometimes an industry representative. It almost always follows three phases: presenting your background, discussing your career project, then questions about your knowledge of the school and the chosen specialization.
What the panel prioritizes:
- Consistency between your current path (prépa, BUT, bachelor's, BTS) and your engineering project
- Your ability to explain technical concepts you've already acquired in simple terms
- Genuine motivation for the chosen specialization (computer science, mechanical engineering, civil engineering, etc.), not just "an engineering school in general"
- Your confidence speaking and your ability to argue under pressure
Building your cover letter step by step
The Polytech cover letter should fit on one page and follow a four-part structure.
1. The hook: avoid the generic "Passionate about science since childhood." Instead, start from a concrete fact: a project, an internship, an academic experience that sparked your interest in the targeted specialization.
2. Your background: explain your current path (prépa, BUT, bachelor's) while highlighting results and skills transferable to engineering, without simply reciting your resume.
3. The project: this is the heart of the letter. Why this specialization, why this particular Polytech site (proximity to a research lab, local industry partnerships, specific teaching approach)? A generic letter sent to multiple Polytech sites is spotted immediately.
4. The conclusion: restate your motivation in one strong sentence and offer your availability for an interview.
💡 Learn more: check our complete guide on the resume and application file for parallel admission within the Polytech network to keep your resume and letter aligned on the same narrative.
Common questions and how to answer them
"Why this Polytech site and not another one?" Show that you've read the network's admissions guide 🔗 and identified a concrete specificity: a research lab, a dual degree, a rare specialization.
"What stood out most in your current training?" Pick one precise example (project, lab work, internship) rather than a generality, and explicitly connect it to the engineering specialization you're targeting.
"Where do you see yourself in 5 years?" A realistic answer grounded in the target sector beats a vague ambition. The panel looks for consistency, not grandiose statements.
"Do you have any questions for us?" Never answer "no." Prepare one or two questions about the curriculum, study-abroad opportunities, or career outcomes of the specialization.
Mistakes to avoid during the interview
- Reciting the cover letter word for word: the panel has already read it and expects elaboration, not repetition.
- Not knowing the content of the targeted program: you can't be convincing without knowing what the specialization actually covers (semesters, projects, mandatory internships).
- Staying vague about your career project: "I'll see later" undermines the panel's interest in your application.
- Lacking concrete examples: every claim ("I'm rigorous," "I enjoy teamwork") needs to be backed by a verifiable fact.
⚠️ Watch out: an otherwise solid application can be weakened by overlooked details. Our article on pitfalls to avoid in an AST application covers the most frequent administrative and substantive mistakes.
Preparation method and interview practice
3 weeks before: list 5 to 8 likely questions and write structured answers (situation, action, result) for each.
2 weeks before: practice out loud, timed, ideally in front of someone who can play the panel's role and challenge your answers.
The week of the interview: prepare a shortlist of questions to ask the panel and review the exact curriculum details of the targeted specialization on the school's website.
On the day: arrive early, wear sober, professional attire, and remember the panel is mainly checking your consistency of path rather than trying to trip you up.
Ready to finalize your application? Write a professional, well-structured cover letter in minutes with our free generator, without worrying about formatting.