Last minute French panic - What grade did i need in the exam for an A?

Using the 2016 grade boundaries (hence, this may be slightly off when the grade boundaries are released next week)
Speaking (Unit 3): Total 49 raw, 71/90 ums
Writing (Unit 4): Total 51 raw, 71/90 ums
71/90 is a B, as for an A you need 80% ums which would be 72/90

Reading and listening are out of 60 ums each. The total ums is 300 for French, hence for an A you need 240 ums.
Having already (roughly) achieved 142 then you need 98 ums between reading and listening.
Hence, you need slightly above the A boundary on average over the reading and listening. (49/60 each while an A would be 48).
Last year you would have needed 28/40 in the listening, and 32/40 in the reading, however the listening this year was meant to have been really difficult so it is likely to be a little less than this.

Grade boundaries are difficult to predict so all I can tell you is that based on last year's grade boundaries for the controlled assessments then you need to average just above an A in the reading and listening papers.
Hope this helps and good luck!