Khan Academy
Khan Academy remains the gold standard for free education — a nonprofit with no ads, no paywalls, covering K-12 math and science in real depth.
Khan Academy's strength is K-12 math and science, covering everything from early arithmetic to AP-level calculus and physics, entirely free.
Sal Khan's approachable teaching style and mastery-based exercises make difficult concepts click, especially in math.
The dashboard clearly shows mastery progress by topic, which is motivating for both students and parents monitoring progress.
Free, permanently — Khan Academy is a nonprofit and has never charged for its core content.
No certificates are offered — Khan Academy is built for genuine learning and mastery tracking, not credentialing.
The mobile app supports offline access, useful for students with limited internet connectivity.
Comprehensive Algebra 1 curriculum with practice exercises.
Free, official SAT prep with personalized practice.
Introductory programming and computer science concepts.
High school-level biology covering cells, genetics, and ecology.
Who should consider Khan Academy?
Khan Academy focuses on free educational lessons and practice resources. It is worth considering for students and adults strengthening foundational knowledge. The official platform website provides current programme and access information.
Build a realistic learning plan
Find the topic you need to understand rather than relying entirely on a year-group label. A learner preparing for algebra may first need fractions and negative numbers. Use a few practice questions to identify that gap, then return to the appropriate explanations.
Turn lessons into practical progress
Write out your reasoning before submitting an answer and revisit mistakes after a short break. Explain a solution in your own words, including why an alternative approach fails. This routine turns repeated exercises into understanding rather than memorisation of a familiar question format.
What learners in Europe should check
Match topics to your own school syllabus or examination requirements, since course organisation may use another education system. Check language availability and notation. Families can use the resources as a supplement while keeping local teachers' expectations and learning objectives in view.
A short learning log can help you track questions, completed exercises and useful examples. Review it each week before deciding whether another lesson or programme is the best next step.