Some best books already suggested my friends , they are Mosby's nclex rn, Zodiac publishers Pathfinder a job designer for nurses, Target high 4th edition , in addition for reasoning, arithmetic and general awareness you can buy online arihant experts, disha experts or RS Agarwals book
Depending on one book is not a good idea, used to familiarise with maximum questions and answers. There are some good books to refer, target high, path finder a job designer for staff nurses, preeethi agarwal comprehensive nursing guide etc
Plain Catgut is a surgical sterile, absorbable suture material from purified sheep gut sub-mucous fibrous tissue (mostly collagen) and it is not processed so our immune system considers it as foreign material and our immune system get activated against it.