Substrate Organic Chemistry funktioniert nicht

Fun rewards make studying delightful. 9 out of 10 students say Substrate is easy to use and helps improve their grades. • "It is really fun and the best app I know to study for organic chemistry". • "I like that it feels like you are playing a mobile game and that it is simple.  Whether you're learning in-person or remotely, Substrate helps you understand challenging organic chemistry concepts and find the motivation to study.  Substrate is an interactive companion to your organic chemistry course, providing relevant practice problems aligned with most textbooks and exams.  Bite-sized sessions deliver varied practice problems and clear feedback so you can stop memorizing and start understanding!  Students using Substrate have seen up to a 1 letter grade increase.  Problems become progressively harder to keep you leveling up your knowledge.  Simple and intuitive design lets you focus on improving your skills.  Switch between 2D or 3D visualization in just one tap.  The simplicity makes it easier to comprehend the topics we are learning in class". • "It helps you reinforce what you learned in class.. ". • "It makes organic chemistry seem fun by presenting it in a game-like manner, which keeps attention longer than traditional homework might". • "Helps me learn chemistry that I find confusing".