Does ENSAI have an integrated preparatory course?

No, ENSAI is not a “post-bac” school. ENSAI recruits students having studied for at least two years at the university level, either through competitive examination after a CPGE MP, MPI, PC, PSI, B/L or D2, or by application after a BUT 2 or 3 (Data Science or Computer Science), a three-year or four-year undergraduate degree or a one-year master’s degree in MIASHS, mathematics, economics, or an equivalent discipline leading to a diploma, in France or abroad.