No. This realistically isn't going to happen.
Unfortunately, TSR is full of well-meaning people for whom telling someone: 'yeah, of course you can do it, just do lots of work etc etc' is just A Nice Thing To Do, rather than actually useful or genuinely helpful to the OP. The truth of the matter is that it is essentially totally unrealistic to expect to increase by three grades in two difficult subjects at this level with so little time left. It happens once in a million cases, and that's usually because there has been some calamity in the student's previous study (deaths, illnesses etc) which has prevented the student studying at a normal rate and the DDB is actually not remotely a reflection of their actual attainment. Alternatively, the student can be super-bright and again has done zero work: they then study for 60-odd hours a week and pull it out of their árse in the examination (again, I can only think of a couple of instances of this). For the student whose attainment
is represented by these grades (calculated from current attainment in in-class tests, mocks, written work etc, and triangulation with established data from previous cohorts), it
can be improved on, by not very much.
Rather than beat yourself up by trying to attain the unattainable (in all likelihood), try aiming for a more realistic outcome - say BCC. You've hopefully been sensible with your university choices and have at least one 'easy' offer which you can fall back on; if you do much better than anticipated, you can always enter Adjustment.
Sorry to be negative, but I'm not going to lie to you just to make you feel better. What would be the point of that?