Khan Academy
Khan Academy: Khan Academy Practice System
Over 800 questions to help prepare for the AP Computer Science Principles exam.
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Khan Academy: Storing Data in Variables
Practice variable assignment in the AP CSP pseudocode, in this set of free practice questions designed for AP Computer Science Principles students.
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Khan Academy: String Operations
Practice programming with string operations like concatenation and substring in the AP CSP pseudocode, in this set of free practice questions designed for AP Computer Science Principles students.
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Khan Academy: Storing and Updating Lists
Practice storing and updating lists for programs written in the AP CSP pseudocode, in this set of free practice questions designed for AP Computer Science Principles students.
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Khan Academy: Numbered Repetition of in Structions
Practice iteration (repeating code multiple times with loops) for programs written in the AP CSP pseudocode, in this set of free practice questions designed for AP Computer Science Principles students.
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Khan Academy: Random Numbers
Practice using random numbers for programs written in the AP CSP pseudocode, in this set of free practice questions designed for AP Computer Science Principles students.
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Khan Academy: Mathematical Expressions
Practice using mathematical expressions for programming in the AP CSP pseudocode, in this set of free practice questions designed for AP Computer Science Principles students.
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Khan Academy: Storing Strings in Variables
Practice storing strings in computer programs, in this set of free practice questions designed for AP Computer Science Principles students.
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Khan Academy: Verifying an Algorithm
Practice verifying whether algorithms are correct with empirical analysis and logical reasoning, in this set of free practice questions designed for AP Computer Science Principles students.
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Khan Academy: Solving Hard Problems
Check your understanding of when algorithms use heuristics and which problems are undecidable, in this set of free practice questions designed for AP Computer Science Principles students.
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Khan Academy: Transport Layer Security (Tls)
Check your understanding of Transport Layer Security (TLS) / Secure Sockets Layer (SSL), in this set of free practice questions designed for AP Computer Science Principles students.
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Khan Academy: Transporting Bits Over Wires
Check your understanding of bandwidth and latency in internet connections, in this set of free practice questions designed for AP Computer Science Principles students.
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Khan Academy: Transmission Control Protocol (Tcp)
Check your understanding of packet sending on the internet with the TCP (Transmission Control Protocol), in this set of free practice questions designed for AP Computer Science Principles students.
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Khan Academy: Symmetric Encryption
Check your understanding of symmetric encryption techniques, in this set of free practice questions designed for AP Computer Science Principles students.
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Khan Academy: The Building Blocks of Algorithms
Practice using the building blocks of algorithms (sequencing, insertion, and selection), in this set of free practice questions designed for AP Computer Science Principles students.
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Khan Academy: Secondary Memory
Types of long term storage of data on the computer and retrieval are examined.
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Khan Academy: File Types
Computers store all files as binary data, long strings of 111s and 000s. Files represent all types of data: images, videos, documents, text files, spreadsheets, and applications. Files are stored as binary data.
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Khan Academy: File Sizes
Small and large computer file sizes are examined with examples of storage data.
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Khan Academy: Input & Output Devices
Computer input and output devices are examined in this article.
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Khan Academy: Hexadecimal Numbers
The Hexadecimal number is explained as well as its relationship and need in computers.
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Khan Academy: Undecidable Problems
Problems a computer can never solve are called "undecidable problems". No algorithm exist that can answer the problem on all inputs.
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Khan Academy: Public Key Encryption
Public Key Encryption, an asymmetric encryption technique, is used to allow computers to securely communicate. The high level process is explained in this article.