Mathematics
- Quantitative Aptitude for Competitive Examinations – R.S. Aggarwal
- Fast Track Objective Arithmetic – Rajesh Verma
General Intelligence & Reasoning
- A Modern Approach to Verbal & Non-Verbal Reasoning – R.S. Aggarwal
- Analytical Reasoning – M.K. Pandey
General Science (Highest Priority for Grade III)
- NCERT Science Textbooks – Classes 9 and 10 (most critical reference)
- Lucent's General Science – Lucent Publications
- General Science for Competitive Examinations – Arihant Experts
General Awareness & Current Affairs
- Lucent's General Knowledge – Lucent Publications
- India 2026 – Publications Division, GoI
Technical (Trade-Specific)
- Electrician/Wireman: ITI Electrician Theory (NCVT curriculum); Electrical Technology Vol. I & II – B.L. Theraja
- Fitter/Mechanical: ITI Fitter Trade Theory; Workshop Technology – B.S. Raghuvanshi
- Grade I Signal: Electronic Devices & Circuit Theory – Robert L. Boylestad; Digital Electronics – R.P. Jain
RRB-Specific Practice
- RRB Technician Grade I & III Solved Papers – Arihant Experts
- RRB Technician Chapter-wise Solved Papers – Kiran Publication