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Our lessons have helped thousands of students achieve success! - For $19. 99 a month, you will get access to all 1,500+ lessons and courses. - Your subscription will automatically renew at $19. 99 each month, billed through your iTunes account. - You can cancel anytime by turning off auto-renew in your account settings. - The subscription automatically renews every month unless auto-renew is turned off at least 24 hours before the end of the current period. - No cancellation of the current subscription is allowed during the active subscription period. - Read our terms of service ( ) and privacy policy ( ) for more information.  1500+ video lessons in Math, Algebra, Calculus, Physics, Chemistry, Engineering, Statistics. 500+ hours of step-by-step instruction. Excel in school.  Learn any subject fast by solving problems step-by-step.