If you find notes at lower price somewhere please check number of pages in that notes we know that Quality can only be judged after purchasing. Seller reduce number of page to bringdown cost & you never get to know.
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How to know if the material is good enough, what if defect comes out
We process about 200 study material everyday and If we will process defective material once , we will loose that customer for always. So we will not take that risk.