text: First, many teenagers who take online courses still have questions or guesses on their answers. Here some reasons why many on the students does not master some courses. The classes related with Math, Chemistry, and History are the complicated for most learners. Those who are assisted by a teacher are the ones with the chance of clarify any problem related with numerical or logic problem; also the teenagers can make corrections in their work by asking for solutions. While the students with online courses are involved with more guesses, but the course program does not provide clear answer or does not provide an answer.