MBA5796 The GMATClub membership is skewed in the sense that there are a lot of eager students who spend quite a bit of effort in preparing for the GMAT, this is a good thing. However, as a result the statistics of what is hard gets skewed. There are many questions that qualify as hard but are clubbed in the 600-700 level.
Based on your score of 440, you will need to exclusively focus on easier questions, at least in the beginning. A good source is the GMAT Paper tests, or you could also get the OG 10th Edition that has 700 or so quant questions and a large number of them are easy, at least in the beginning. That is where I would start, once you get the hang of the structure and language of easier GMAT questions, then you can move on to the harder stuff.
You will also need to brush up on your basics, I know from experience that students who are at your score level benefit tremendously from strengthening their foundation.
Cheers,
Dabral