Like in your own language, reading in English is going to expand your vocabulary, enhance your sentence structure and give you exposure to a more complex language. It will help you learn quicker and consolidate what you already know. Reading can be done autonomously and at your own pace and is more effective than watching the television.
In addition, there are thousands of classic free eBooks available in the public domain. This makes it an ideal low-cost way to learn. All you need is an e-reader, mobile device or computer and away you go!