diff --git a/certificates/essentials/test.md b/certificates/essentials/test.md
index 69f6e18..c6e9d5f 100644
--- a/certificates/essentials/test.md
+++ b/certificates/essentials/test.md
@@ -1,5 +1,7 @@
 # Chapter 1
 
+*Selecting an Operating System.*
+
 ## Suggested Exercises
 
 * Make a list of the programs you run as an ordinary user, including everything from a calculator applet to a major office suite. Look for equivalents at http://www.linuxrsp.ru/win-lin-soft/table-eng or http://www.linuxalt.com. Is there anything you can't find? If so, try a Web search to find an equivalent.
@@ -34,6 +36,8 @@
 
 # Chapter 2
 
+*Investigating Linux’s Principles and Philosophy*
+
 ## Suggested Exercises
 
 * Read the Features Web page on FreeBSD, http://www.freebsd.org/features.html, a competitor to Linux. How would you say it differs from Linux?
@@ -68,6 +72,8 @@
 
 # Chapter 3
 
+*Understanding Software Licensing*
+
 ## Suggested Exercises
 
 * Look up the GPLv2, GPLv3, and BSD 2-clause licenses. http://www.opensource.org/licenses/ is a good place to find them all.) Read them and compare them. Which would you use if you were to write an open source program?
@@ -102,6 +108,8 @@
 
 # Chapter 4
 
+*Using Common Linux Programs*
+
 ## Suggested Exercises
 
 * Try at least two different desktop environments. Use each desktop environment for your normal computing tasks for a day or two so that you can decide which you prefer.
@@ -136,6 +144,8 @@
 
 # Chapter 5
 
+*Managing Hardware*
+
 ## Suggested Exercises
 
 * At a Linux shell prompt, type `uname -a`, `lscpu`, and `cat /proc/cpuinfo` [Compare the output and try to determine your CPU's capabilities. In particular, can it run 64-bit applications, and is your current distribution a 32-bit or 64-bit distribution?
@@ -170,6 +180,8 @@
 
 # Chapter 6
 
+*Getting to Know the Command Line*
+
 ## Suggested Exercises
 
 * Read the `man` pages for the following commands: `man`, `less`, `cat`, `cd`, `ls`, `grep` and `su`.
@@ -206,6 +218,8 @@
 
 # Chapter 7
 
+*Managing Files*
+
 ## Suggested Exercises
 
 * Create a file with `touch` (or some other program) and then practice copying it with `cp`, renaming it with `mv`, moving it to another directory with `mv` and deleting it with `rm`.
@@ -251,6 +265,8 @@ total 276
 
 # Chapter 8
 
+*Getting Help*
+
 ## Suggested Exercises
 
 * Fully read at least three `man` pages for common Linux commands, such as `ls`, `cp`, `cat`, or `less`. What have you learned about these commands that goes beyond the descriptions in this book?
@@ -286,6 +302,8 @@ total 276
 
 # Chapter 9
 
+*Using Programs and Processes*
+
 ## Suggested Exercises
 
 * Is your distribution's software up to date? Locate the option in your desktop environment's menus to run a package manager and check that the system is up to date. A computer running out-of-date software can be vulnerable to bugs and security threats, so keeping your software updated is important!
@@ -332,9 +350,9 @@ total 276
 1. Which of the following commands will print lines from the file `world.txt` that contain matches to `changes`and `changed`? 
 	* A) `grep change[ds] world.txt`
 	* B) `tar change[d-s] world.txt`
-	* C) `find "[change\'d\|s]\'" world.txt`
+	* C) `find "change'd|s'" world.txt`
 	* D) `cat world.txt changes changed`
-	* E) `find change[\^ds] world.txt`
+	* E) `find change[^ds] world.txt`
 2. Which of the following redirection operators appends a program's standard output to an existing file, without overwriting that file's original contents? 
 	* A) `|`
 	* B) `2>`
@@ -389,8 +407,6 @@ total 276
 7. ASCII supports `____________` unique characters.
 8. Three keystrokes that can initiate a search-and-replace operation in `nano` are F14, `____________` and `____________`.
 9. While in Vi's command mode, you can type `____________` to undo a change. 
-	* Ctrl+F
-	* Ctrl+W
 
 # Chapter 12
 
@@ -543,7 +559,7 @@ terminal
 	* B) `chmod`
 	* C) `ls`
 	* D) `chown`
-4. TruE) e or false: A file with permissions of 755 can be read by any user on the computer, assuming all users can read the directory in which it resides.
+4. True or false: A file with permissions of 755 can be read by any user on the computer, assuming all users can read the directory in which it resides.
 5. True or false: Only `root` may use the `chmod` command.
 6. True or false: Only `root` may change a file's ownership with `chown`.
 7. What option causes `chown` to change ownership on an entire directory tree?
@@ -622,4 +638,3 @@ terminal
 7. The `____________` program serves as a multi-purpose network tool; it can do many of the same things as `ifconfig`, `route`, and several others.
 8. The traditional name for the first Ethernet interface in Linux (but not in recent versions of Fedora) is `____________`.
 9. A `____________` is a program or system configuration that blocks or enables network access to, from, or through a computer based on criteria you specify.
-