I would say it is “considerably tough” to score 600 in NEET, going solely by the fact that only about 300 students are able to secure >600 marks out of the 7 lakh odd students who appear for the exam.
That means only about 0.05% students are able to score >600.
But one can achieve this seemingly difficult task rather easily by clinging on to the most important virtue of perseverance(constant hardwork).