Is HC VERMA and AIRHANT books of JEE MAIN are available in Amazon. orelse where it is available

The books are availabe on Amazon, You can avail it. Firstly I would suggest you to go thrugh well with NCERT Books as it will help you to clear the concepts.

Careers360 has also come up with JEE Achievers Preparation package which includes unlimited tests, online 24*7 expert chat facility system, conceptual e-lectures and many more plus points for you. It has a time table feature as per which you will have to choose the exam date and your complete time table will be auto-created as per what topic you should focus on and the amount of time to be given on each topic.

Apart from the above mentioned:The best part is-

In respect to the program mentioned, you can practice the tests any time of the day and that too unlimited, so utilize it to the extent.
There are concept wise lectures, which means you can get your minimal to important concepts cleared and followed with it can give the test and analyse your performance.
Even if you plan to study at 3am, and you face any query, you have online doubt facility system where the experts will help you asap and you don't have to wait till next day.

Further to know more benefits helpful for you, you can check details and proceed from here- https://goo.gl/zTUHWw

Good Luck!