I’ll start with a highly informative table.

Topics	Relevant Files	Grade
3.1-3.2	Hacks Markdown, Python .ipynb	1/1
3.3-3.4	Hacks Markdown	1/1

Now I’ll talk about some key takeaways

Topics 3.1-3.2

Variable names should be concise yet sufficiently describe the purpose of the variable. For example, the variable name priceApples is descriptive enough to show its purpose: storing the price of apples
There are variable types which can be appropriately applied to different situations
Boolean variables are applied to binary, true and false situations (such as whether someone is hungry)
Integer/float variables are applied to situations involving numbers, especially those that can be altered by mathematical operations (addition, subtraction, etc.)
String variables are appropriate for storage of data (in words) or identification numbers where math is not typically applied. They are enclosed in quotation marks.
Variables can be assigned different ways in different programming languages. Here are some examples:

CollegeBoard pseudocode

numApples ← 10

Python

numApples = 10

It is possible to assign the value of a variable to another variable. If the variable a value is assigned to already has a value, that value is typically overwritten. Here’s an example in pseudocode:

data1 ← 10
data2 ← 25
data1 ← data2

In this case, the final value of data1 would be 25 since the value of data2 overwrites that of data1 in the third line.

The last takeaway is that lists can be assigned as variables. These are often put in square brackets ([]) and the entries are separated by commas. The parts of the list are called elements and can exhibit the same data types as variables.
Each element in a list is assigned an index, a nonnegative integer which is associated with the element in future commands.
It is very important to note that different forms of indexing can exist between programming languages. CollegeBoard pseudocode assigns the first element in a list the index 1, while other languages (including Python) assign the first element the index 0.

Topics 3.3-3.4

Lines of code in a program are executed in a specific order. This pattern is known as sequencing.
Programs often incorporate selection, where associated lines of code are executed if a condition is satisfied. Often, a different set of commands will be executed if a condition is not satisfied. These most commonly take the form of if statements in python.
Sometimes, programs need to execute lines of code on multiple elements in a list. Instead of writing similar lines of code repetitively, an iteration strategy is used. This often consists of a loop (including for loops, while loops, and recursive functions) which executes associated commands on all items in a list or repeatedly until a certain condition is fulfilled (or is not fulfilled).
There are various operators which can apply mathematical operations on integer/float variables.
Addition (+), Subtraction (-), multiplication (*), and division (/) are identical to the operations learned in arithmetic.
The modulus operator (seen as a % in Python) performs a division operation but outputs the remainder instead of the quotient.
There are certain string-related commands in pseudocode that are not on the exam reference sheet. Their validity and syntax quirks are therefore uncertain.
substring(string, n, m) reads a given string (or string variable) and starts at the nth character of that string. It reads m characters from that point. This output can be assigned to a variable.
concat(string1, string2) essentially results in an output of string1string2 (in other words, the strings mashed together without any spaces). This output can be assigned to a variable.