When you are preparing for the BCS exam, you can no longer rely on your memory. It is necessary to have a reliable source of information. You can no longer depend on your own internal resources to solve the problems.

If you want to be a successful candidate in the BCS exam, you have to study from reliable sources of information. There is no other way to achieve success in the BCS exam. You have to study from a book, the internet, or a reliable source. It is not possible to solve the problems by relying on your own internal resources.