How can I score 600 in NEET UG within 1 year?

Dedicated, serious and proper study with determination, resolution , hard labour and confidence will certainly fetch you the desired score .
Follow as advised :
Strictly follow the syllabus
Go through all the topics of all the chapters as per syllabus , never be selective
Solve previous years’ problems
Take mock tests to enhance your speed , clarity of concepts
Do repeated revision of the chapters which appear clumsy
Keep in mind that without basic knowledge , you can’t solve any problems , so try hard to acquire basic knowledge so that you have a strong concepts of every topic which is most essential to go through any exams