How hard is it to be accepted to Sorbonné university? (formally UPMC)

I'm a foreign students and I want to attend Sorbonn I university (created at the beginning of the year as a merger of the original Sorbonne and the University of Pierre and Marie Currie) I want to study mechanical engineering there, I see the Shanghai rankings ranks them 26th for engineering (and 4th for maths). Long story short I started my A levels 6 months ago and managed to complete them in 4 months, now I am writing exams and it looks like B's are the best I'll get ( I'm doing maths, advanced maths and physics). For my IGCSE'S I got A* for maths, biology, physics, A for chemistry and B for English. I am capable of much better than B's but due to the time constraints.... Would that be enough for me to get in? I have A LOT riding on this.