1. ​1,525 practice questions with answer keys. That's 56 topic-wise sets plus 2 full-length mock tests, and every numerical has a step-by-step solution.
2. Built on the real previous year paper. Each unit is weighted by how many questions it got in the actual BTSC exam (09 Sept 2023). Units 2 and 6, which together made up 46% of that paper, get the most space.
3. Every PYQ is solved inside its chapter. Each question from the previous paper sits in the relevant chapter, with its reasoning and solution.
4. Official answer-key errors are flagged. Where the official key is mathematically wrong (for example, the wave-winding and alternator regulation questions), the book gives the correct answer and explains why.
5. Covers the full official syllabus, Units 1–8. It was checked line by line against the DSTTE syllabus. This includes topics most books skip: first aid, rivets and wooden joints, diode characteristic curves, and bill of material and cost estimation.
6. 96 diagram-based questions. Readers practise identifying circuits, BIS symbols, wiring diagrams, waveforms, logic gates and machine connections, the way the real exam shows them.
7. Every question format the exam uses. Besides direct MCQs, there are statement-based, assertion-reason and matching questions, with a method for solving each type.
8. Trap options that mirror common mistakes. Wrong options are built from the errors candidates actually make, and the solutions point out each trap.
9. General Awareness and Bihar special section. Covers Polity, History, Geography, Economy, Computer and Bihar GK, with practice MCQs.
10. Exam guide and 60-day study plan. Includes a summary of Advertisement 23/2026 with the conditions for the 25 experience marks, negative-marking strategy, and a day-by-day preparation schedule.

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