Academic writing tends to use more complex sentence structures.  As a result, questions about syntax, or word order and phrase order, tend to arise.  The following are websites that review usage and provide a few quizzes:

Syntax models -- a good review, moving from the simple to more complex examples:  http://web.grinnell.edu/individuals/dobbs/DrSyntax/syntax.html

Quiz:  http://web.grinnell.edu/individuals/dobbs/DrSyntax/synexer.html

The function of word order:  http://web.grinnell.edu/individuals/dobbs/DrSyntax/order.html

Transitions within sentences:  http://web.grinnell.edu/individuals/dobbs/DrSyntax/trans1.html