Preschool age is from:

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E6 Kaplan Sadock's Synopsis of Psychiatry-2022 (pp 1-3768 of 3768) p. 2815-2817
E6 Text Book Of Pediatric Nursing 3rd Panchali Pal — Part 1 (pp 36-238 of 713) p. 103-105
E6 Nursing Fundamentals Potter Perry 12e Part 1 p. 178-180
Practise the full IGNOU PB Bsc Entrance-2023
Attempt every question from this paper in a timed mock, then review the full solution for each one.