In reply to Barbora, and to all of you out there, I know if you could get away without revising some sections, some of you may take that option:
Looking at the last 2 summer's worth of exams (which are available on the blog):
May 05 SL
Paper 1: Choice of 1 Essay from 4 on sections: 2, 3, 4, 1/5
Paper 2: 3 questions out of 5 on sections: 2, 3, 4, 5, 5
May 06 SL
Paper 1: Choice of 1 Essay from 4 on sections: 1/2, 3, 4, 5
Paper 2: 3 questions from 5 on sections: 3, 2, 2, 5, 5
May 05 HL
Paper 1: Choice of 1 Essay from 4 on sections: 2, 3, 4, 1/5
Paper 2: 3 essays from 6 on sections: 5, 2, 3, 3, 4, 5
Paper 3: 3 questions from 5 on sections: 2, 3, 3, 4, 5
May 06 HL
Paper 1: Choice of 1 Essay from 4 on sections: 2, 3, 4, 5
Paper 2: 3 essays from 6 on sections: 2, 2, 2, 3, 2, 5
Paper 3: 3 questions from 5 on sections: 2/5, 3, 4, 4, 5
So in a word, no. But! You'll need to be pretty hot on all the other section and I know that you don't all love some of the other sections either.
Good luck all