# Trevor Klee, Tutor

## Online and Boston-based GMAT, GRE, LSAT, and MCAT Prep.

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### GMAT Critical Reasoning Cheat Sheet: A Proven Strategy From A 99th Percentile Scorer & Tutor (FULL Guide)

We all know that scoring well on GMAT’s Critical Reasoning isn’t a cakewalk. Getting a good score relies on great practice. But for some of us, even after lots of hard work and effort, CR can be a tough nut to crack. Why is this the case? It’s almost always down to having the wrong […]

### What to know about arithmetic and geometric sequences

Note: this post is taken from my GRE Quant Bible. If you’d like fully explained practice questions to go along with this, get the book! How to recognize:  Whenever we’re adding up a long sequence of numbers What to know: 1. Occasionally, we’ll be asked to add up a lot of consecutive numbers, or numbers […]

### How to answer really tricky RC main point questions from a 47V scorer (example included)

I was coaching a GMAT client the other day through some tricky RC questions, and he was getting stuck on main point questions. Unsurprisingly, he was also getting really stuck on understanding what the passage was saying at all. Here’s the advice I gave him: For all passages, the main point can be found in […]

### What to know about combinations and permutations for GMAT quant

This is by far the most dreaded topic on the GMAT. Here’s what you need to know about it, excerpted from my guide to GMAT quant. How to recognize:  Any time a question asks about the number of different ways or combinations something can be arranged, or if we’re trying to count the ways we […]

### Using the word “which” vs “that” on GMAT Sentence Correction

This is a pretty common issue on GMAT Sentence Correction. As any GMAT taker can tell you, the GMAT loves using the word “that”. So when should you use it? Well, I’ve excerpted the below from my book on GMAT Sentence Correction so that you know. Now, the word “that” in general denotes a necessary […]

### What to know about pronouns for GMAT Sentence Correction

Pronouns come up frequently as a grammatical issue on GMAT Sentence Correction. Here’s what you need to know about them, excepted from my book on GMAT Sentence Correction. Pronouns are words that stand in for nouns. “It”, “he”, “they” are all pronouns. “Its”, “his”, and “their” are also pronouns. Pronouns need a clear antecedent, which […]

### What to know about verb tenses for GMAT Sentence Correction

Verb tenses matter in GMAT sentence correction for two reasons: meaning and grammar. Meaning-wise, it matters whether an action is occurring in the past, present, or future. Grammatically, parallelism sometimes requires that certain verbs be in certain tenses. In parallel phrases, it’s pretty easy to match up which verb tense should be which. However, it […]

### The rules for parallelism on GMAT sentence correction

Most people think about parallelism on GMAT Sentence Correction the wrong way. They worry too much about how to apply parallelism, and not enough about when to apply parallelism. Parallelism only applies in 3 situations: lists, comparisons, and around conjunctions. Lists are straightforward. You want to make sure your reader knows the things are connected. […]