focusing on one subject is more useful

I've been studying English for maybe 7 years, of course not continuously and not determinedly, but I didn't get my expected result and I think that's the same issue many people of my ages have. Since I changed my way of studying English I got many much better results.
In those 7 years, I studied English but just for improving my knowledge and knowing more words and even when since I decided to study for the IELTS exam, I haven't studied continuously because I have some other purposes  priorities such as studying my books and becoming more independent, so I used to study two or three hours in on other days. However, I put time for studying English but (?) I haven't learned as much as in the time I specified.
After a while of not getting my willing desired result, I changed the way that I studied. Currently, I study English the entire day and give my other purposes activities up, and I feel awesome about that, I mean, I become more knowledgeable about that and I really enjoy learning English.

English Day 21

Today I had a busy day. I've read a few articles on the History of the USSR before the Second World War. I got positive emotions, because the USSR was really successful in that time. I enjoyed reading the government's manifests. They were written in a kind of literary, but clear way. Unfortunately, that success had led to the dizziness with success and to the deterioration in living standards of the workers. Yet it feels so high (what do you mean here by 'high'?) if you know history.
After reading that I went out with my friend. It was a cloudy, but warm day. We just played cards and talked. Then I came back home and had a lesson of German. German lesson. Thanks thank goodness, this time not for three hours! I think in at such a pace I'll start speaking German in a month or two or tomorrow. Yet I think the German grammar is complicated.