I can suggest you a very good book: Raymond Murphy: English Grammar in Use (a self-study reference and practice book for intermediate students of English - Cambridge University Press). There are 136 units in the book. Each unit concentrates on a particular point of grammar. Some problems are covered in more than one unit. Each unit consists of two facing pages. On the left there are explanations and examples; on the right there are exercises. At the back of the book there is a Key for you to check your answers to the exercises. There are also seven Appendices at the back of the book. These include irregular verbs, summaries of verb forms, spelling and American English. I think, it's a very good book for self-study if you would like to improve your English grammar.

A lot of people watch commercials. They say the products and emphasis in the commercials help them recognize English words. Also watch movies or a documentary. Many English movies can come with foreign subtitles. Good luck!