Algebra is the branch of mathematics that uses symbols (like letters) to represent numbers in formulas and equations. It helps...

To succeed in the HESI A2 Anatomy & Physiology section, especially regarding the Lymphatic and Immune System, you should focus...

Which pronouns to use in various grammatical situations. How to correctly identify and use different types of pronouns Common mistakes with pronoun-antecedent...

In nursing and on the HESI A2, problem-solving and decision-making are not just helpful—they're essential.

Biological classification (taxonomy) is the process of organizing living organisms into groups based on shared characteristics and evolutionary relationships. Scientists...

This guide breaks down all 12 verb tenses with simple explanations, examples, and tips to help you avoid common mistakes....

Simple machines are basic mechanical devices that reduce the amount of force needed to do work. They work by either...

This guide explains the key glands, hormones, and functions of the endocrine system in a student-friendly way. It’s designed to...

This guide breaks down subject-verb agreement in a clear, student-friendly way for the HESI A2 Grammar section. It covers rules,...

This topic covers how to confidently work with numbers in their three most common forms: Whole Numbers – Numbers without fractions...

Prioritization of care refers to deciding which patient or task requires immediate attention. It’s more than listing tasks—it involves analyzing...

Solutions are homogeneous mixtures of two or more substances. In chemistry and medicine, precise knowledge of how much solute is...

Evolution is the central concept that unifies all of biology. It explains how living organisms change over time and how...

Electricity and magnetism form one of the most essential domains in physics, with direct applications in medical equipment, diagnostics, and...

The human body is made up of organ systems—groups of organs that work together to perform specific functions. These systems...

What You’ll Learn The structure and roles of DNA and RNA The steps of protein synthesis (transcription and translation) The difference between mitosis...

In nursing, clear and logical thinking is essential for accurate clinical judgment and patient safety. Misinterpreting patient information, blindly following...

What You’ll Learn How to evaluate the strength and credibility of arguments and evidence How to distinguish between valid reasoning and flawed...

In nursing and health sciences, assumptions can influence how you interpret symptoms, evaluate patient reports, and make clinical decisions. Misinterpreting...

Matter exists in different forms depending on energy and molecular interaction. In biology and medicine, gases (like oxygen and carbon...

A chemical reaction is a process in which substances (reactants) are transformed into new substances (products). In biological systems, reactions...

Atoms form bonds to achieve stability. These bonds—ionic, covalent, and metallic—differ in how electrons are used. Lewis structures visually represent...

The periodic table is a foundational tool in both chemistry and biology. In nursing, knowing the trends helps in: Understanding how...

Momentum isn’t just for car crashes. It’s about how mass and velocity combine to create motion, and how that motion...

Work, energy, and power are foundational concepts in physics and everyday healthcare. Whether it’s lifting a patient, adjusting bed height,...

This section introduces the foundational skills of logical reasoning and inference, essential for analyzing information, drawing conclusions, and making informed...

Forces are the hidden agents behind every movement — whether it’s a caregiver lifting a patient, a nurse applying CPR,...

This comprehensive study guide dives into the essential topic of cell structure and function—a cornerstone of HESI A2 Biology and...

Understanding clauses and phrases helps you recognize complete thoughts versus incomplete ones. This skill is key to writing clear, grammatically...

Understanding how a passage is organized helps you follow the author’s message clearly and answer questions faster. It’s like seeing...

Mastering word origins builds confidence and boosts accuracy on the HESI A2 Vocabulary section.

The urinary system filters waste from the blood and maintains the body's fluid, electrolyte, and pH balance through the production...

The muscular system enables movement, posture, and essential body functions through three muscle types: skeletal, cardiac, and smooth. It relies...

Introduction Motion is at the heart of physics. It describes how objects move, change position, and respond to forces — whether...

In physics, everything begins with measurement. Whether tracking motion, applying force, or understanding energy, nothing can be described, calculated, or...

Understanding the Nature of Reasoning Reasoning is the heart of all thought. It’s how we figure things out, solve problems, make...

Chemistry is the foundation of many medical processes. As a nurse, you will need to understand how drugs interact with...

Biology is a fundamental part of the HESI A2 exam, covering cells, genetics, metabolism, microbiology, and human biology. This study...

Unlock the power of clear, evidence-based thinking with this detailed study guide! Logical reasoning and inference are the core of...

Understanding the difference between facts and opinions is critical when interpreting reading passages. Facts are statements that can be proven...

Data interpretation in reading comprehension focuses on understanding how numbers, statistics, or trends presented in a passage affect the overall...

In reading comprehension, themes are the underlying messages or central ideas explored in a text, and moral lessons are the...

In the Vocabulary section, data interpretation means understanding how a word is used in a specific context. The same word...

Multiple-meaning words (also called homonyms or polysemous words) are words that have more than one definition. On the HESI A2,...

Idioms and figurative language involve expressions whose meanings are not always clear from the literal definition of the words. On...

Decimals and percentages appear throughout the HESI A2 math section. You must understand how to convert between decimals, fractions, and...

Fractions, ratios, and proportions are essential components of the HESI A2 math section. You'll need to understand how to simplify,...

Measurement conversions are a key component of the HESI A2 math section. You are expected to understand and convert between...

Get ready to dive into the system that keeps you alive with every breath! This guide breaks down the Respiratory...

Anatomy and Physiology (A&P) is one of the most important sections of the HESI A2 exam, testing your understanding of...

Mastering the parts of speech is essential for understanding sentence structure, improving grammar, and excelling in the HESI A2 exam....

This comprehensive study guide is designed to help you master the grammar skills needed to excel on the HESI A2...