Both reading and writing are good to improve the studies. Each of them have their own benefits. For example, when there is time and individual can write and learn but when there is no time writing is not a good practice. In such a case, reading is very important than writing.
When an individual writes on a paper and learn, there is a chance for the individual to understand better and can remember well. If the things are remembered well, it is a very good opportunity to improve the studies in one way. But, when the individual don't understand and simply write, there's a less chance to understand well and remember for a longer time. So, it is very important for an individual to learn with perfection. Writing helps in getting the perfection.
And when there is no time, it is very important to read rather than writing. Because, when an individual do not read and simply writes when there is no time, it is very difficult to cope up with the situation. So, It's very important to know when to read and when to write and must implement it in a proper way.