The MPrep Sentence Correction guide has two lists of idioms for exactly this reason! Focus on two things:
1. The 'short list' of commonly tested idioms, in the 'idioms' chapter of the book (NOT the long list in the appendix)
2. Any idiom that actually causes you to miss a problem while you're practicing.
There are many things you should focus on before you work on idioms, such as modifiers and parallelism. If you aren't already at a pretty high level with the more commonly tested SC topics,
...
1. The 'short list' of commonly tested idioms, in the 'idioms' chapter of the book (NOT the long list in the appendix)
2. Any idiom that actually causes you to miss a problem while you're practicing.
There are many things you should focus on before you work on idioms, such as modifiers and parallelism. If you aren't already at a pretty high level with the more commonly tested SC topics,
...





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