Quant Guidance

I am looking forward to start my GMAT journey.I am planning to start with self preparation for exam with Quantitative section.
I don't have much study material for the Quant, so I am planning to buy some quant books.

Could anyone suggest, what could be the best study material source for starting with quantitative section?
Till now what I could get is " MGMAT Guide set "is pretty decent for thorough knowledge on Quant, could you please give your expert thoughts on this?

How could i start my preparation with quantitative section and what is the best study source to do so?


Thanks,
Harsh