Proportion Calculator: Solve Ratios Instantly
A free interactive proportion calculator that solves a/b = c/d for any missing value using cross-multiplication. Includes the formula, worked examples, and common mistakes explained by Dr. Irfan Mansuri.
Free Math, ACT Prep & Science Study Guides
NCLEX Practice Questions Set 47: 100 Questions With Rationales
100 free NCLEX practice questions with the answer and a full rationale for every item. Set 47 of 54.
Study Guide: How to Make One That Actually Works
A complete, expert-backed guide to building a study guide that actually improves your grades. Includes step-by-step instructions, a comparison of methods, worked examples, and a printable checklist.
CDL Practice Test: Complete Study Guide 2026
A complete CDL practice test guide covering every exam section, real worked examples, and proven strategies to pass your Commercial Driver’s License test on the first attempt.
Cálculo da Hora: Complete Step-by-Step Guide
A complete guide to calculo da hora (hour calculation): clear formulas, worked examples, a comparison of methods, and an FAQ — everything a student needs to calculate time confidently.
ServSafe Practice Test: Complete Study Guide 2026
A complete ServSafe practice test guide covering food handler and manager exams, real sample questions, a contrast-driven good vs. bad answer breakdown, and a free CSS quiz to help you pass on the first attempt.
NCLEX Basic Care and Comfort: Complete Topic Guide
Basic Care and Comfort is about 9% of the NCLEX test plan. All 6 topics in one guide — key concepts, high-yield facts and what the exam asks.
College GPA Calculator – Instant GPA & Grade Tool
Use this free interactive college GPA calculator to compute your semester or cumulative GPA instantly. Includes the formula, worked examples, common mistakes, and expert tips from Dr. Irfan Mansuri.
NCLEX Basic Care and Comfort Practice Test: 18 Questions With Rationales
9% of the NCLEX test plan. 18 free basic care and comfort practice questions with full rationales and why each wrong option fails.
CNA Practice Test: Complete Study Guide 2026
A comprehensive CNA practice test guide covering exam structure, key content domains, worked examples, and proven study strategies to help nursing assistant students pass on their first attempt.