Becoming an engineer without going through a scientific preparatory class is nothing unusual: about a quarter of new entrants to French engineering schools now arrive through a parallel route rather than the classic "prépa" path. The question is knowing which exam to target and how to build a credible file when your background does not follow the "standard" route.
Can you become an engineer without a scientific prépa?
Yes, and it is an increasingly structured path. Most French engineering schools, accredited by the Commission des Titres d'Ingénieur (CTI) 🔗, offer parallel admissions open to holders of a BTS, a BUT, a scientific Licence or, more rarely, a non-scientific background completed by a refresher program. Even the most selective schools, such as École Polytechnique, reserve a small number of places each year for students who have completed at least two years of a Licence with an excellent academic record.
The CTI, an independent body tasked since 1934 with evaluating and accrediting engineering programs in France, does not itself set each school's admission terms, but guarantees that the degree awarded, whatever the entry route, certifies an equivalent level. An engineer admitted in L3 through parallel admission therefore earns the same protected title as one who came through a prépa.
AST exams open to engineering schools
Several routes coexist depending on the profile and the targeted school. Some schools run their own file-based admission process, particularly for Licence or scientific BUT candidates, with or without additional written tests. Others rely on joint exams shared across several institutions, which pool the tests and widen the choice of accessible schools with a single application file.
What most of these routes have in common: selection relies more on the file and the interview than on a classic written exam, unlike the prépa route. The panel evaluates the coherence of an already-engaged academic path rather than the ability to solve general-purpose tests under time pressure.
🎓 To compare the scores expected across schools, our guide on TAGE MAGE, TOEIC and TOEFL in parallel admission details the thresholds generally observed, including for scientific tracks that require a similar logic test.
What scientific level is required
The required level varies significantly by school and engineering field. A generalist school in construction or computer science will more readily accept a technical BUT profile with a solid project record, while a school more focused on fundamental engineering (mechanics, electronics, applied mathematics) will expect a scientific level closer to that of a prépa student.
For a candidate from a non-scientific track, the switch is possible but usually requires a prior refresher program, whose length depends on the gap between the initial background and the expected level. Some candidates go through a dedicated year of preparation for scientific parallel admissions before sitting the exams themselves, which extends the project but significantly secures the chances of success.
How to build a credible file when changing careers
An engineering parallel-admission panel wants to understand one thing above all: why now, and why this route rather than another. A credible file combines three elements.
A coherent story. The panel quickly distinguishes a well-thought-out project from an opportunistic application. You need to be able to explain, with concrete examples, what triggered the interest in engineering and the steps already taken to close the level gap (online courses, personal projects, refresher training).
Proof of scientific level. Even without a prépa, it is possible to demonstrate quantitative ability: technical projects completed independently, solid grades in the scientific subjects of the followed track, certifications or MOOCs completed seriously.
A resume that translates the background into strengths. A non-scientific profile should reframe its experience to highlight analytical rigor, project management or quantitative skills already practiced, rather than presenting them as a mere add-on.
💼 If your career change starts from a completely different sector, our guide on career-change resumes and our career-change cover letter template offer a method that transfers to the engineering sector.
Financing your career change
Financing depends largely on the chosen route and status at the time of application. A candidate already employed can use their Compte Personnel de Formation (CPF, personal training account) for a refresher program or dedicated preparation, or even negotiate a professional transition leave with their current employer depending on seniority.
For a candidate still studying or continuing their education, the tuition fees of the targeted school remain the main cost: they vary widely between institutions, with means-tested scholarship programs and sometimes merit-based scholarships specific to parallel admissions. Apprenticeship programs, where the school offers them on the engineering track, allow a large part of tuition to be financed while building professional experience valuable at the end of the program.
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