Certificates / Logical reasoning / Series
Series: lesson, then the certificate test
Step 1: the lesson (about 1 min)
Letter and number series follow a steady step: write the positions and find it.
- Letter positions: A = 1 … Z = 26. A memory aid: E J O T Y = 5, 10, 15, 20, 25.
- Past Z, count on from A again.
- If one step does not fit, check alternate terms as two series.
Worked example
B, E, H, K, ?
- 2, 5, 8, 11: each step is +3
- 11 + 3 = 14 = N
Answer: N
Watch out
- Losing count past Z: Y + 3 is B (25 + 3 = 28, and 28 − 26 = 2).
Made by Shishya (AI-assisted): a general method in our own words, with our own example; no exam or platform question is copied.
Step 2: the test
- 15 questions from Shishya's checked question bank, 20 minutes. Pass mark: 11 correct.
- Scored on Shishya's server; the answers are not shown afterwards, so the test stays fair. Each attempt draws new questions.
- Free. Your first test needs no account; sign up free to take more. Your answers and score are not stored; if you pass, you choose the name to print (ages 13 and up).
- It is a Shishya completion certificate — not a university or government credential. The test is not supervised.