How can you best study and remember certain aspects of English grammar (e.g. tenses)?
When reading English texts (lyrics, novels, news, textbooks) look out for the grammar aspect you want to remember. Mark it and reflect on why it is used there.
To see whether you're right about a rule, look up the topic in an English grammar reference, your English textbook or on ego4u.
The proof of the pudding is in the eating. (And the proof of the grammar is in the reading.) ;o)