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In theory, it works, but on a small scale.  say you skipped Derivatives.  5-15% is a big range, but if you really can nail down the others, that’ll still get you a pass.  worst case, say derivatives ended up being 15%,  statistically, you should grab 5% with random guessing.  you max out at 90%.  That’s still a lot higher than the 70% safe range.
As soon as you start gambling skipping 2 or 3 sections, then your chances of failure increase dramatically.