Frankly speaking, I little remember about studying English in secondary school. I think it cause by not good experience of learning English. Especially, in high school, it is said that we were studied for getting through the examination. In this position, I can say most of studying English in high school is least valuable and enjoyable language learning activity.
Though there were some valuable language learning activity and enjoyable language learning experience. First is ward game. I'm sorry I don't remember its rule, I enjoyed these game. (e.x. line ward game) And it was help for me to learn English wards. Second, having conversations with ALT is very good activity, I think. Because we never use English in usual, there is not better activity than that. But this activity has big problem. It is that Japanese students are too shy. They fear to mistake in conversation, so they seldom try to talk with ALT. I think if we can bleak this situation, this activity is one of the best activity.
After all, we should not teach only "受験英語". I think Learning pleasure of conversation leads students being good at English. Therefore we need to try to have students get minimum conversation skill.