my scores are constantly ranging between 120-130 marks . what should my strategy be in these last days.

This is the time to practice a lot. Don't focus on concept building at this stage. You should work on improving your speed and try to solve more questions in a section.

Focus on taking mocks and sectionals at this stage. If you are already scoring 130 marks in mocks, you should try to increase your marks in the area of your strength. If you are scoring 50 in Quant which is your strength, try to make it 60 by getting 3 more questions correct on an average. And likewise for other sections.