Hello Aspirant

Firstly it is very important to have clarity with NCERT as NCERT is of the utmost importance when it comes to NEET. 

You should minimum solve last 10 years question papers. There are certain repetitive themes that you should thoroughly prepare. This would help you in ensuring a minimum score.

The question papers can be acquired through any bookstore that sells academic books and college forms. 

A score of 330 is not unattainable and you should definitely aim for that. Your aim should always be high and you should prepare accordingly. You should aim for a high score in order to get a good seat in the college of your preference. 

Best of luck!