I've read the FAQ about questions that are welcomed here. But I'm not sure what kinds of problems encountered by people learning English can be asked here. After all, "how to improve my English", which is absolutely not welcomed, may also be a problem encountered by a student when s/he is learning English.
For instance, students who are struggling with GRE verbal test, especially those whose first language is not English, may like to know what kind of reading materials (magazines, journals, etc.) are good for preparing their GRE. What categories should this kind of questions belong to?