My Recommendations:

• Just One Author Books: For Students who wants to follow just one author book to cover all their needs I would recommend following books
• Maths: G Tewani Cengage Publications
• Physics: DC Pandey (set of 5 books)
• Chemistry: KS Verma Cengage Publications
• Reference/Theory/Questions Separate Books:
• Maths (Reference): None
• Maths (Theory): NCERT
• Maths (Questions): G Tewani Books and Comprehensive Mathematics By Tata McGraw Hill
• Physics (Reference): Resnick, Halliday and Walker
• Physics (Theory): HC Verma Volume-1 and Volume-2
• Physics (Questions): DC Pandey (all 5 books) and BM Sharma Cengage Publication
• Chemistry (Reference):
• Physical: None
• Inorganic: JD Lee
• Organic: LG Wade
• Chemistry (Theory): NCERT
• Chemistry (Questions):
• Physical: KS Verma
• Inorganic: OP Tondon, KS Verma
• Organic: KS Verma, RK Gupta
• Must Have Complementary Books:
• 14 years Solved papers (2003–2016) or a newer version from Arihant Publications
• 38 years topicwise chapterwise solved papers (Maths: Amit M Agarwal, Physics: DC Pandey, Chemistry: Ranjeet Shahi)