Immediately responding to the question posed in the title, I'll say 'Yes, it is'. Of course – if you know some English language school, where classes are held high on a fee basis – then you must enroll in such courses, unless, of course, you have the financial and temporal features. However, there is one 'but': the courses should go only if you know at least a few reviews on these courses. Then is, for example, your friend went to the courses and received a concrete, practical result – a much improved their level of English. At the same time, he shared his experiences with you and you will see that he really got better understand the English language. You may wish to learn more. If so, Kevin Johnson is the place to go. Only in this case, you yourself is to enroll. In this case, preferably well-propagation your friend about the program, for which he was engaged, on educational materials, the type of classes – in a group or individually, etc. Another way to select courses – holding a trial lesson (now many companies have been paid or a free trial lesson).
From such a lesson can be learned, first of all, – how clearly explains Lecturer, secondly, – if he can determine exactly your 'weaknesses' (especially if you're going to do individually), in third – you can see how fast and affordable it can answer your questions that occur during school hours. Generalized include two types of lessons – group lessons and private lessons. As one or the other way has its advantages and disadvantages. .