weak quant

I'm struggling a lot in quant. I have been preparing for about 2-3 months now but my quant section is still very weak. I dont have confidence in any topic as such. I have covered arithmetic, algebra and geometry however in mocks i am barely able to do only 3-4 qs in quant. How do I improve my quant section to get a score of min 30 marks in the time left? pls advise.