Nursing entrance examinations are mostly consists of three paper- Physics, Chemistry and Biology. However you haven't mentioned the exam name, but in nursing Entrance exams, questions are asked from PCB Group. For Physics, Chemistry and Biology parts, NCERT Textbooks of Class 11 and 12 are the best for preparation. As NCERTs are written in simple Language, these are best for building the concept. You must follow the NCERTs and write down all the important formulae in a notebook so that whenever needed you can access them anytime. Apart from NCERTs, you can also rely on BSc General Nusring Entrance Exam Guide latest edition by Arihant Publications. Once the syllabus is completed, you can move on to solving previous year exam papers and give mock tests as much as possible. The more you'll solve papers before the exam, the more you can score.