High school can be hard. Below is a list of free academic resources you may find useful for classes and standardized tests.
Subject Help
Online Tutoring (Math, SAT, Homework Help) - Schoolhouse.world
Multiple Subjects - Khan Academy
History, Social Studies, Science, General Learning YouTube Channel - Crash Course
Chemistry YouTube Channel - Jeremy Krug
Calculus, Precalculus, Algebra 2, Geometry YouTube Channel - MathWithMrsGA
Physics YouTube Channel - The Organic Chemistry Tutor
Computer Science - freeCodeCamp
Writing & Grammar - Purdue OWL
Advanced Math (Linear Alg, Differential Equations, Calculus) - 3Blue1Brown
SAT Prep
ACT Prep
AP Prep
Official AP Courses & Exam Resources - AP Central
Official AP Lessons & Exercises - AP Classroom
AP Exam Prep - Fiveable
AP Homework & Tutoring - Schoolhouse.world
AP US History, AP Euro History, AP World History, AP Gov YouTube Channel - Heimler's History
AP Calculus YouTube Channel - 3Blue1Brown
AP Calculus AB YouTube Channel - MathWithMrsGA
AP Calculus, AP Statistics, AP PreCalculus - Math Medic
AP Physics, AP Chem, AP Bio YouTube Channel - Bozeman Science
AP Bio YouTube Channel - Amoeba Sisters
AP Chem YouTube Channel - Jeremy Krug
AP Readiness (focus on Humanities APs) - Macro Learning
AP English Language - Macro Learning
AP Art History YouTube Channel - Smarthistory
Art Fundamentals (AP Art & Design) YouTube Channel - Proko
AP Music Theory - MusicTheory.net
Music Theory & Ear Training - Teoria
AP Economics, AP Psychology, AP Human Geography YouTube Channel - Mr. Sinn
AP Microeconomics & Macroeconomics YouTube Channel - Jacob Clifford
IB Prep
Official IB Sample Exam Papers & Specimen Papers - International Baccalaureate Sample Exam Papers
IB Study Guides - IB Academy
IB Biology - MSJ Chem
IB Chemistry - MSJ Chem
IB Physics - Chris Doner
IB Mathematics - Revision Village
Official IB Free Learning Resources - IB Free Learning