Take up this articles quiz and locate your skills. This is one particular topic where many students are unable to perform well due to lack of understanding and inability to retain the rules.
Here is an elaborate post on the basic articles and its usage
If you have not taken up the first quiz on articles proceed to this link Articles Quiz.
Articles – Quiz Instructions:
Attempt the quiz at your own pace. The quiz does not contain any restriction on time. You can take up the quiz as many times as you want.