## Using Khan Academy to Prep for the GMAT or GRE – Redux

I posted about this a while ago and included a list of suggested exercises and videos in a pdf. Since then I’ve revised and updated the list and you can find it here: GMAT Prep with Khan Academy It’s bigger and better and includes a lot of important stuff I missed the first time.

However, one of the major pitfalls of this approach is that students aren’t very familiar with Khan Academy. It takes a little know-how to get the most out of it. I’m going to fix this with this video

## The GMAT Exam Format is Changing!!!

In 2016 several of my students were offered the opportunity to take the GMAT in any order they wanted – i.e. they could opt to take the Quantitative, Verbal, Integrated Reasoning, and Analytical Writing Assessment sections first and arrange the other three sections as they saw fit. Sounded awesome at the time, but I never heard anything else about it… until now

## Unofficial Guide 2017 – PS 51

A video explanation of problem 51 from the 2017 Official Guide to GMAT Reviewe

Check it out

## Mixtures Quiz

This is my first word problems quiz. It’s short because mixtures and weighted averages aren’t exactly high payoff. It’s only PS questions at moment. I may throw in some DS in the near future. I’ll keep you posted on new quizzes and updates to all existing quizzes.

Anyway, check it out on the Quizzes and Tests page

## Using Kahn Academy for GMAT or GRE Prep

If you don’t know what Khan Academy is, watch this. When it comes to GMAT prep, using Khan Academy can be a very effective tool for refreshing basic skills, but there’s a catch – KA content is aligned to the common core state standards for math. The GMAT is NOT aligned to the common core.

## The 2017 Official Guides

Working with my students I have noticed a couple of errors in the latest version of the Official Guide. When I investigated I found that there are a lot of errors – 60 by my count as well as 6 grammatical errors in their guide to the SC questions!!!

## Challenge Problem 2 2016

(Note: Not drawn to scale)

In triangle ABC, CE is perpendicular to AB and BD is perpendicular to to AC. If EC = 5 and BD = 3, what is the ratio of AC to AB?

(A) 3 : 5          (B) 3 : 4          (C) 4 : 5          (D) 1 : 1          (E) 5 : 3

## Unofficial Guide 2016 PS 101

I’m going to do a number of these posts. You can think of them as commentary on the 2016 Official Guide for GMAT Review. I’m going to use the abbreviations PS, DS, RC, CR, and SC for Problems Solving, Data Sufficiency, Reading Comprehension, Critical Reasoning, and Sentence Correction. Sometimes I’ll present alternative solutions, more detailed solutions, and, occasionally an example problem.

I can’t reproduce the complete problem here, so if you don’t have your official guide handy, now would be the time to break it out – page 167

## Challenge Problem 1 2016

If $${5}^{k^2}\times{25}^{2k}\times{625} = 25\times {\sqrt[4]{5}}$$, which of the following is a possible value of $$k$$?

(A) $$-1$$

(B) $$-\Large\frac{1}{2}$$

(C) $$0$$

(D) $$\Large\frac{1}{2}$$

(E) $$1$$

## Unofficial Guide 2016 PS 162

I’m going to do a number of these posts. You can think of them as commentary on the 2016Official Guide for GMAT Review. I’m going to use the abbreviations OG, PS, DS, RC, CR, and SC for Official Guide, Problems Solving, Data Sufficiency, Reading Comprehension, Critical Reasoning, and Sentence Correction, respectively. Sometimes I’ll present alternative solutions, more detailed solutions, and, occasionally an example problem.

I can’t reproduce the problem here, so if you don’t have your official guide handy, now would be the time to break it out – page 175