classes: lecturer. I studied at an English center outside of school, the duration is reasonable, not much less about 2 - 3 periods a session! curriculum. I studied at an English center outside of school, the duration is reasonable, not much less about 2 - 3 periods a session! facility. I studied at an English center outside of school, the duration is reasonable, not much less about 2 - 3 periods a session! general. I studied at an English center outside of school, the duration is reasonable, not much less about 2 - 3 periods a session!