One way to improve reading skills is to just make sure you are reading regularly. It is good to at least be in the process of regularly reading 2-3 books at any given time to be a regular reader. As you read more, you will improve in your reading speed and ability to understand the text. After you have read a book it is also good to read the book again since you will always get something new reading the book a second time which you did not get reading it the first time.
Another way to improve your reading skills and comprehension is to ask yourself questions about what the author is saying and the ideas that he or she is conveying. It would also be good to read books of multiple genres and authors so that you are introduced to a variety of subjects and writing styles. For example, you could try to always read a fiction book, a non-fiction book, a book by a contemporary author, and a book by a historic author.