You can study verb tenses -structure and use-with powerpoint presentations. Structures- is where you can see Conditionals, Passives, use of Modals.
As for prepositions, some charts with verbs and adjectives followed by this particle, also some explanations about prepositions of place and time.
Word formation is about Wordbuilding and transforming words, using suffixes, preffixes.....But still in process......a long one!
Meanwhile, English for life provides great amounts of tests for all different standards of the language. The yellow pencil is also a good site for younger learners...