The HSC Biology Book and Notes is a free app that contains a lot of biology MCQs, with the answer key, so that you can check yourself, and also, for your preparation, you can find out the level of difficulty of the questions, the number of questions and answers, and also, the total time to complete the test.

This is a great app for all the students, and especially, for those who are preparing for the HSC exam. It is useful for them to check the level of difficulty of the questions, and also, for their preparation, they can check the time required to complete the test.