Hello , to get the government medical college seat through neet you have to score atleast 550 marks and above . As of you are belong to sc category the Cutt off marks are little lower as 450-500 marks are required to get the government seat through sc qouta . 

The important books for organic and physical chemistry is NCERT also it is important for physics as well .

Other than NCERT , the books for solving mcq are ..

Organic chemistry - USS, NCERT fingertips 

Physical chemistry- USS (universal science scorer) 

For physics- USS, NCERT fingertips, Pradeep 

NCERTbooks are definitely must for NEET preparation however you must also refer to Past papers to examine pattern. Also refer to books like HC Verma for physics and OPTandon for Chemistry  

Minimum 295 marks must in State quota Sc Category and Minimum 445 marks must in aiQ and Sc Category. 

Cutoff for SC category in AIQ and State quota at all Government colleges in Karnataka shsred below. 

https://medicine.careers360.com/articles/neet-cutoff-karnataka