It can definitely be done! My predicted grades were AAB, and i applied to 3 places that were asking for AAA, one that was asking for ABB and one BBB. I got a reduced offer for one of the AAA places, an an unconditional for the ABB place! I ended up getting all 5 offers, and im one of the lucky ones as my application was very risky.
The hard bit is deciding where to firm!