I have the three grammar dictionaries by The Japan Times, and they always help me understand what I'm looking up. The problem is, they don't have any practice questions, and they don't include every piece of grammar that appears on the JLPT. They're dictionaries, and I need something to give me some structure and to test my comprehension as well.
I have an eight week course series of JLPT2 books, which are okay, but the grammar is introduced in example sentences only, which leaves a lot to be desired. I've realised lately that I haven't been learning a lot of new grammar, and when I flick through the dictionaries, there are tens of expressions that I don't know.
If somebody could recommend some good books for learning JLPT2-1 grammar, or general workbooks with lots of questions, I'd be grateful. I bought a workbook from White Rabbit press called 文法の弱いあなたへ, which was actually pretty fun to work through, and the only thing like that I've come across so far.