Dear ranjan
You can attempt part test as well as full length test.
to know more about test series available ,Date and syllabus of the test series check this link
http://www.askiitians.com/iit-jee-test-series.aspx
Please feel free to post as many doubts on our discussion forum as you can.
If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly.
We are all IITians and here to help you in your IIT JEE & AIEEE preparation.
All the best.
Regards,
Askiitians Experts
Badiuddin