Under the official Railway Recruitment Board (RRB) Centralised Employment Notice (CEN), the Computer Based Typing Skill Test (CBTST) is conducted under strict standardized parameters.
1. Official Notification Clause 13.5 Specifications
| Criteria / Rule | Official RRB English Standard | Official RRB Hindi Standard |
|---|---|---|
| Notification Clause | Para 13.5 (CBTST) | Para 13.5 (CBTST) |
| Test Duration | 10 Minutes | 10 Minutes |
| Minimum Words in Passage | 300 Words | 250 Words |
| Minimum Qualifying Net Speed | 30 WPM (Words Per Minute) | 25 WPM (Words Per Minute) |
| Permitted Keyboard Font | Standard English QWERTY | KrutiDev 010 / DevLys 010 / Mangal |
| Editing & Backspace | Disabled (Locked after Space) | Disabled (Locked after Space) |
| Retyping Facility | Enabled (Cycle repeat if finished) | Enabled (Cycle repeat if finished) |
2. The Official RRB Mistake Calculation Formula
As per the official RRB CBTST evaluation manual:
$$\text{Mistakes Allowed (5% Exemption)} = \text{Total Words Typed} \times \frac{5}{100}$$
$$\text{Excess Mistakes} = \text{Total Mistakes Committed} - \text{Mistakes Allowed}$$
$$\text{Penalty Deductions} = \text{Excess Mistakes} \times 10 \text{ Words}$$
$$\text{Net Speed (WPM)} = \frac{\text{Total Words Typed} - \text{Penalty Deductions}}{10 \text{ Minutes}}$$
📌 Notification Case Study:
-
Scenario A: Candidate types 350 words with 15 mistakes.
- 5% exemption = $350 \times 0.05 = \mathbf{17.5 \text{ mistakes exempted}}$.
- Since total mistakes (15) are within 17.5, zero penalty is deducted.
- $\text{Net Speed} = 350 / 10 = \mathbf{35 \text{ WPM}}$ $\rightarrow$ QUALIFIED!
-
Scenario B: Candidate types 350 words with 25 mistakes.
- 5% exemption = 17.5 mistakes.
- Excess Mistakes = $25 - 17.5 = \mathbf{7.5 \text{ mistakes}}$.
- Penalty Deductions = $7.5 \times 10 = \mathbf{75 \text{ words deducted}}$.
- Net Words = $350 - 75 = \mathbf{275 \text{ words}}$.
- $\text{Net Speed} = 275 / 10 = \mathbf{27.5 \text{ WPM}}$ $\rightarrow$ DISQUALIFIED (Below 30 WPM Cutoff).
3. Practice Under Official RRB CBTST Interface
Practice with the exact locked-backspace algorithm and 10x deduction scoring on TypingWire.in.