SAT / ACT Prep Online Guides and Tips

Dr. Fred Zhang

Fred is co-founder of PrepScholar. He scored a perfect score on the SAT and is passionate about sharing information with aspiring students. Fred graduated from Harvard University with a Bachelor's in Mathematics and a PhD in Economics.

Recent Posts

How to Read Our Teaching Explanations (Answers / Solutions)

Posted by Dr. Fred Zhang | Feb 1, 2019 1:00:00 PM

Teaching Explanations

At PrepScholar, we call our answers / solution manuals “Teaching Explanations”, because we believe answers should be geared to teaching you how to tackle the question. This is why we answer your questions in up to four different ways. Let's go over the different types and what they mean.

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Stewart’s Calculus 8th Edition, Section 1.1, Question 3

Posted by Dr. Fred Zhang | Jan 16, 2019 8:00:00 PM

Teaching Explanations

This posts contains a Teaching Explanation.

You can buy Calculus by Stewart here.

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Brown's Chemistry: The Central Science, 15.8 Exercise 1

Posted by Dr. Fred Zhang | Jan 16, 2019 7:00:00 PM

Teaching Explanations

This posts contains a Teaching Explanation.

You can buy Chemistry: The Central Science here.

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Stewart’s Calculus 8th Edition, Section 1.1, Question 2, Pg. 19

Posted by Dr. Fred Zhang | Jan 2, 2019 7:00:00 PM

Teaching Explanations

 

This posts contains a Teaching Explanation.

You can buy Calculus by Stewart here.

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Stewart’s Calculus 8th Edition Section 1.1 Question 1

Posted by Dr. Fred Zhang | Jan 2, 2019 4:00:00 PM

Teaching Explanations

This posts contains a Teaching Explanation.

You can buy Calculus by Stewart here.

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What's a Good 7th Grade ACT / SAT Score?

Posted by Dr. Fred Zhang | Dec 9, 2018 5:48:00 PM

SAT/ACT Score Target

The SAT / ACT is incredibly important for many students.  It's used to determine admissions into talent programs like Duke's TIP or Johns Hopkins CTY.  It's also a good predictor of future college potential.  

But how do you know what a good SAT / ACT score is for someone in middle school?  Here, Dr. Fred Zhang does a novel analysis on two data sets to find what is considered a good score for middle school students.

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SAT Score Ranges: Understand Your Score vs Class Grades

Posted by Dr. Fred Zhang | Aug 13, 2018 1:00:00 PM

SAT General Info

What’s the best possible SAT score and worst possible SAT score you could get? How do you understand SAT scores if you’re used to letter grades like A- or B+, or test scores like 93%? In this guide, we convert SAT scores into much more understandable class grades to help you interpret your SAT score.

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What's a Good 10th Grade ACT/SAT Score?

Posted by Dr. Fred Zhang | Jun 1, 2018 12:00:00 AM

SAT/ACT Score Target

Are you a 10th grader considering taking the SAT or ACT? Then you probably want to know what a good SAT/ACT score is for sophomores. While you might think we can simply use raw test score data from 11th graders, this information isn't totally accurate for or relevant to sophomores. Here, I'll analyze two data sets to figure out what's considered a good SAT/ACT score for 10th graders.

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What's a Good 8th Grade ACT / SAT Score?

Posted by Dr. Fred Zhang | May 17, 2018 8:00:00 PM

SAT/ACT Score Target

The SAT / ACT is a good predictor of future college potential.  During 8th grade these tests are looming ahead, but how do you know what's a good SAT / ACT score for someone at this grade level?  Here, Dr. Fred Zhang does a novel analysis on two data sets to find what is considered a good score for middle school students.

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What's a Good 9th Grade ACT / SAT Score?

Posted by Dr. Fred Zhang | May 16, 2018 8:00:00 PM

SAT/ACT Score Target

The SAT / ACT is coming up quickly for 9th graders, but using raw SAT / ACT data mostly from 11th graders to see if you're doing well isn't correct.  Here, Dr. Fred Zhang does a novel analysis on two data sets to find what is considered a good SAT or ACT score for 9th grade students.

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On the SAT, How Many People Get a 1400, 1500, or 1600?

Posted by Dr. Fred Zhang | May 3, 2018 7:00:00 PM

SAT/ACT Score Target, SAT General Info

How many students get a high score on the SAT?  How many students get a perfect score?  Here we look at the number of students and the percentile of these top ranks. Then we find out whether you should retake the SAT if you get these scores.

Note: This guide was created when the SAT used its old 2400 scoring scale. Unfortunately, we don't have the same data for the current version of the SAT (out of 1600 points), but we do have a conversion chart below so you can convert your 1600-scale SAT score to a 2400-scale score and still make use of the information in this article.

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SAT Score to GPA Conversion Table

Posted by Dr. Fred Zhang | May 1, 2018 11:00:00 PM

SAT General Info

Do you want to convert your GPA to SAT scores, or vice versa? Perhaps you're wondering what SAT score you might get based on your high school grades. In this article, we've pored through the statistics to let you do just that! Before we jump into the data, though, we do have some caveats to be aware of.

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Should You Take the New SAT or Old SAT? An Expert Guide

Posted by Dr. Fred Zhang | Mar 1, 2018 11:00:00 AM

SAT Strategies, New SAT

You might have heard over the last year that a new version of the SAT is coming out in spring of 2016. You might have a choice between taking the current old SAT or the new SAT -- depending on when you time your test. You're probably wondering, "when should I take the SAT?"  Well, here's our definitive guide.

Note: The old SAT is no longer available. If you took the previous version and aren't sure whether to take the new one, check out our guides to deciding, depending on whether you got a high score or a low one. 

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SAT II Biology E/M Study Guide: Best Books and Schedule

Posted by Dr. Fred Zhang | Feb 8, 2018 10:00:00 PM

SAT Subject Tests

The SAT II Biology E/M Subject Test is a good choice for students looking at medicine or who want to show off their hard science skills. But what's the best way to study for the Biology E/M Subject Tests? What are good books and study schedules? Read this guide to find out!

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New SAT vs Old SAT: Changes You Must Know

Posted by Dr. Fred Zhang | Feb 5, 2018 6:00:00 PM

SAT Logistics, New SAT

In 2016, the SAT changed drastically from the old SAT. In terms of content, no other SAT changes in the past few decades have been this dramatic. If you're familiar with the old SAT, here's what you must know to do well on the current version of the SAT.

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