Write it down, play with sentences, and get yourself a teacher here. Talking and constructing sentences is, as far as I know, the best way to remember grammar. If you repeat a structure often enough, it ought to become second nature. Don't just write it down and leave it there. You really need to use it for it to stick. This goes double for asian languages

I like to memorize one example sentence for each grammar point. Like, memorize it really well! Then I can play with the construction and change out words in that sentence. I am a really auditory learner so I like the series 耳から覚える (mimi kara oboeru). They are JLPT study books with a CD. The narrator says the grammar point and then reads an example sentence. When I was studying for N1, I would listen to the CDs over and over again. It really helped cement the grammar. Not sure what level you are at, but here is an example: http://shop.jpbooks.co.uk/product.php?id_product=8259

In my case, reading aloud many times and reciting were really useful. Besides, you had better write something in Japanese and post on this site. You can receive many corrections from native speakers.

Check these out! http://a2.marugotoweb.jp/en/grammar/ http://nihongo-e-na.com/eng/site/tag/Grammar/ Personally, I think a language learner should learn solid grammar basics directly from teachers. Then you can go wherever you want after that. These sites should be supplementary resources. Ganbatte Ne!　(*´Д｀*) b!