http://www.themathpage.com/aPreCalc/binomial-theorem.htm
http://www.intmath.com/Series-binomial-theorem/4_Binomial-theorem.php
The above 2 links give you a variety of questions in binomial theorem to practice.The answers are hidden and after you are done with your attempt of resolving, you can refer the answers.In the first link, just moving your mouse cursor over the highlighted area in pink would expose the answer.In the second one,you have to click to view the answers.
I’m telling from my experience in Maths that each and every question in binomial theorem are somewhat of same kind.Of course,there are twists which you have to figure out.After practicing the above set of questions,it won’t be any problem for you to toy with binomial theorem related questions.If you need any further help,feel free to ask me anytime.