Aim at + an object (noun, gerund, noun clause etc.);
Aim to + verbal infinitive.
We aim at an improvement, at a business target, an achievement;
we aim to do something, to reach a target, to finish a task (before leaving work), arrive somewhere at a given time.
Aim to (idiom) meaning - Try or intend to do something, as in We aim to please, or She aims to fly to California. This term derives from aim in the sense of "direct the course of something," such as an arrow or bullet.
Aim at (idiom) meaning - Direct a missile or criticism at something or someone. In his last speech the President took aim at the opposition leader.
Source: http://gmatsentencecorrection.blogspot.com/search/label/PARALLELISM?updated-max=2007-04-13T05:43:00-07:00&max-results=20 & http://www.proz.com/kudoz/english/business_commerce_general/1981366-aim_at_vs_aim_to.html
Indeed a very good lesson for the students and surely for the future these would help them in their writings and grammar techniques. online rephrasing tool
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