Hey aspirant

I would recommend you to go through jee main syllabus and strictly adhere to that. For chemistry and math ncert and ncert examplar book is enough for extra problem you can refer previous year paper book of any publisher.For Physics i would recommend you to prepare easy chaters with sure shot questions very well like units and measurement, gravitation,atoms and nuclei and communication . You can get refer hc verma and previous year questions .(Buy a book with chapterwise previous year question and do each and every question of it)