Mental Ability (सामान्य मानसिक योग्यता)
Mental Ability in BSTC / Pre D.El.Ed is the pattern-recognition section of the paper: series, analogy, classification, coding–decoding, blood relations, direction sense, ranking, syllogism, clocks, calendars and cube/dice questions. Most items are designed to be solved in under a minute once the rule is spotted, so the skill being tested is rule detection, not lengthy calculation.
Core rules
- Series: test differences first, then ratios, then interleaved (odd/even position) series; check squares, cubes and their ±1 variants.
- Analogy: name the relation (part–whole, worker–workplace, cause–effect, synonym) before looking at options.
- Coding–decoding: compare letters position by position; watch for +n/−n shifts, reversal (A↔Z) and letter-sum codes.
- Blood relations: draw a tree with male/female symbols; never solve it mentally.
- Direction sense: draw axes and rotate left/right relative to the direction the person is facing, not the page.
- Syllogism: use Venn diagrams; "all A are B" is not reversible, "some A are B" is.
Worked example
If TEACHER is coded as VGCEJGT, code STUDENT. Aligning letters gives T→V, E→G, A→C, so each letter moves +2. Apply the same shift: S→U, T→V, U→W, D→F, E→G, N→P, T→V. The code is UVWFGPV. Always verify the rule on the last letter too, because some codes shift the first half forward and the second half backward.
Traps that cost marks
Do not assume a uniform +1 shift from one example. In ranking questions, "between" excludes both named people, and total = left rank + right rank − 1. In calendar questions, count odd days rather than total days. In blood relations, never infer gender from a name - only from words like father, sister, son.