Only gamblers stay a full month without refreshing their memories on what the already know because in as much as trading is concerned there are multiple ways of predicting market flows and it only takes consistent research to get a hand full of approach to maintain a good profit margin in trading.
Which is why you don't basically have to read but you need to stay informed. Information can be gotten by various means these days which reading is just one of them. You can learn through listening to audios or watching of videos which focus in those area you intend getting more knowledge about in regards to trading. When you put it in the way the title is written, it seems like trading has a direct relationship to reading and if you're not reading then you can't be good at trading but that's not true.
If the reading has to do with charts analysis then your statement can be justifiable but when it involves reading of trading material then that's not true anymore. Although this isn't a discouragement to those picking interest in reading trading material but since we're humans and not everyone has the same learning capabilities then it's quite important to note that learning can be achieved in different methods that doesn't have to do with reading.