People do learn differently. What works for others does not mean it will work for you. I recommend that you not only recite a word, but look at the word, here the word used, use the word in sentences of your own creation, and write a sentence of your own creation. Seeing, hearing, speaking, thinking, writing- Cover all the forms of learning and you will have the best chance of remembering it. As you find one of these things helping more than the others, this is a clue to how YOU learn. Do that activity more.

Your method of learning English needs some help. You are learning grammer, vocabulary, and sentence structure. This is good. You just need to listen to native speakers, and I think you are doing this also. It takes time to master a second language. If you are learning a British system, this will be a little different from an American version. Your program should use both systems....but with any English language program, you will be able to communicate. You will just need to get accustomed to different accents, different spellings, and a few word changes. Keep trying, and you will do fine.

学习英语的普通话比学习更容易 In America, they say that Mandarin is one of the hardest languages to learn. I want to learn Mandarin, luckily, I have the advantage of knowing Cantonese already:)