Your problem is not taking the
BTEC (that will help you) bit more importantly you need to be taking maths to go to a top uni for computer science
The BTEC is really good in my opinion, I did the one that was worth 3 A levels and didn't take an extra A level and I now have my Computer Science degree from a top 30 uni and am currently studying my Masters at a top 10 uni.
Also Oxford and most Russell groups accept the BTEC for computer science as long as its combined with Maths A level
If I were you, I wouldn't take
French or History as they would be pointless for a Comp Sci degree, I would take the
Com Sci BTEC (2 A levels) and then Maths + Physics as a 4th if you can handle it
Hope this helps