Practising speaking English more, your English vocabulary will be promoted considerably.
You will find a lot of interesting short English stories on the internet with audio which will help you practise listening skill. Then, you write down what you have just listened on papers in past simple tense and change into other tenses such as past perfect, simple present or future.
You can use online or ask your friends, native teachers to check your dictation and grammar errors. After a short time, your grammar will be surely gained considerable results.