Dear aspirant
Yes you can join allen test series. They are really helpful. And whatevr doubt you have you can ask the faculties there. Clear all the doubts in every single question. And dont keep it for later.
The cost depends on what program you take.
All the best.

Hello!

That depends on which program you select. Kindly check out Allen Institute's site or ask for information at one of their centers to know more about the same.