16 of the 26 aptitude questions
were already in our maths material
TNPSC Group 1 Preliminary Examination, 27 September 2026 · booklet CCSEI-P26. We checked every aptitude question in the paper, by hand, against our maths book, home test batch papers, question bank, Samacheer textbook exercises and past TNPSC papers.
The Aptitude and Mental Ability questions in booklet CCSEI-P26 sit in two blocks — Q90 to Q101 and Q187 to Q200. That is 26 questions of the 200. We read all 26 and traced each one back through our own material.
2026 செப்டம்பர் 27ஆம் நாள் நடைபெற்ற குரூப் 1 முதல்நிலைத் தேர்வில், கணித திறன் மற்றும் மனத்திறன் பகுதியில் 26 வினாக்கள் இடம்பெற்றன — வினா எண் 90 முதல் 101 வரையிலும், 187 முதல் 200 வரையிலும். இந்த 26 வினாக்களையும் எங்கள் கணித நூல், ஹோம் டெஸ்ட் பேட்ச் தாள்கள், வினாத் தொகுப்பு, சமச்சீர் கல்விப் பாடநூல் பயிற்சிகள் மற்றும் பழைய வினாத்தாள்களுடன் ஒவ்வொன்றாக ஒப்பிட்டுப் பார்த்தோம். அவற்றுள் 16 வினாக்கள் ஏற்கனவே எங்கள் பயிற்சிப் பொருட்களில் இடம்பெற்றிருந்தன; 4 வினாக்கள் அதே எண்களுடன் அப்படியே திரும்ப வந்தன.
Why this number is so much higher than the rest of the paper. Across all 200 questions we found 53 we had already covered — about 26%. In the aptitude section alone it is 62%. General Studies is effectively unbounded; the aptitude syllabus is small and the same topics come back year after year. That is what makes these 26 marks the most winnable on the paper.
Watch: every maths question worked out
Our full walkthrough of the Group 1 2026 maths and aptitude questions — each sum solved step by step, in Tamil. One hour eleven minutes.
GROUP 1 2026 Maths Answer Key · Athiyaman TNPSC · published 27 September 2026 · Watch on YouTube
How we graded the 26
| Verdict | Count | What it means |
|---|---|---|
| Word for word | 4 | Same question, same numbers — a student who had worked it could write the answer straight down. |
| Same question, re-worded | 12 | Same method and same step, different names or numbers. |
| Not in our material | 10 | We had not set this exact question — though every one falls inside a topic we teach. |
Which of our material carried them
| Source | Of the 16 it covered |
|---|---|
| Maths book | 11 |
| Home test batch | 11 |
| Question bank | 10 |
| Samacheer textbook | 7 |
| Past paper | 6 |
These add up to more than 16 on purpose — most of the 16 appear in two or three of our sources at once, which is exactly why a student working through the full set met them repeatedly.
The 16, question by question
Each card gives the question as it appeared in CCSEI-P26, then every place in our material where the same question or the same step had already been set. No answer keys are printed on this page — the Commission’s key is the authority. The video above works every sum through step by step.
The dimension of a brick are 24 cm × 12 cm × 8 cm. How many such bricks will be required to build a wall of 20 m length, 48 cm breadth and 6 m height?
(A) 22000 · (B) 21000 · (C) 23000 · (D) 25000
Find the difference in compound interest and simple interest for principal 8000 and the rate 5% in 3 years.
(A) Rs. 12 · (B) Rs. 20 · (C) Rs. 61 · (D) Rs. 51
Divya bought Rs. 30,000 from a bank to buy a car at 20% simple interest. If she paid Rs. 18,000 as interest while clearing the loan, find the time for which the loan was given.
(A) 6 years · (B) 5 years · (C) 4 years · (D) 3 years
A, B, C took a house on rent for one year for Rs.13,824. They remained together for 4 months and then C left the house. After 5 more months, B also left the house. Then how much rent should ‘B’ pay?
(A) Rs. 3,456 · (B) Rs. 7,872 · (C) Rs. 4,416 · (D) Rs. 1,536
The income of a person is increased by 20% and then decreased by 20%. Then the change in his income is ________.
(A) 1% increase · (B) 3% decrease · (C) 5% increase · (D) 4% decrease
The difference between the 13th and 12th Fibonacci number is ________ (if the first two numbers are F₁ = 1, F₂ = 1).
(A) 144 · (B) 89 · (C) 55 · (D) 34
How many dots are there on the dice face opposite to the dice face with three dots?
(A) 2 · (B) 4 · (C) 5 · (D) 6
Fill in the blanks : 197 T 99, 226 S 120, 257 R 143, ________, 325 P 195.
(A) 225 Q 169 · (B) 289 Q 169 · (C) 290 Q 168 · (D) 290 Q 169
If the first two statements are true, the third statement is (i) All jasmine in the garden are white. (ii) Some flowers are jasmine. (iii) All flowers in the garden are not white.
(A) True · (B) False · (C) Uncertain · (D) None of the above
A and B together can complete a piece of work in 15 days and B alone can do it in 20 days. In how many days can A alone complete the work?
(A) 70 · (B) 80 · (C) 40 · (D) 60
10 persons begin to work together on a job but after some days 4 persons leave. As a result, the job which could have been completed in 40 days is completed in 50 days. How many days after the commencement of the work did the 4 persons leave?
(A) 20 days · (B) 30 days · (C) 35 days · (D) 25 days
A sum of money triples itself in 12 years when the principal and compound interest are added. In how many years will it become nine times the sum?
(A) 36 years · (B) 24 years · (C) 42 years · (D) 72 years
A sum of Rs. 1,550 was lent partly at 5% and the remaining amount at 8% simple interest. The total interest received after 3 years was Rs. 300. The ratio of money lent at 5% to that lent at 8% is ________.
(A) 5 : 8 · (B) 8 : 5 · (C) 31 : 6 · (D) 16 : 15
If LCM of a and b is 100 and a + b = 45. Find the difference between a and b.
(A) 55 · (B) 5 · (C) 25 · (D) 15
A train Travels from Chennai to Delhi for 53 hours. If the train starts on Monday night 8.30 pm, find the day and time when the train would reach Delhi.
(A) Wednesday 1.30 am · (B) Wednesday 1.30 pm · (C) Thursday 1.30 am · (D) Thursday 1.30 pm
A store reduces the price of 1 product by 20%. How many % do you need to raise to the % to get the original price.
(A) 30% · (B) 27% · (C) 25% · (D) 20%
The other 10 — not the same questions, but the same patterns
Being straight about it: ten of the 26 were not set as questions in our material. But not one of the 26 was unfamiliar. Every one of these ten follows a pattern that has been asked before in TNPSC papers, and every one has practice questions set on it in the batch — the table below maps each to the test that drills it. That is the difference between working a full syllabus and working a question list.
இந்தப் பத்து வினாக்களும் ஏற்கெனவே கேட்கப்பட்ட வகைகளைச் சார்ந்தவை; ஒவ்வொன்றுக்கும் தேர்வுத் தொகுதியில் பயிற்சி வினாக்கள் உள்ளன.
| No. | Question | Topic | Test that covers it |
|---|---|---|---|
| Q94 | HCF of x^(a+9), x^(a+7), x^(a+5) is ________. | HCF of algebraic terms | T-02 HCF & LCM |
| Q97 | In an A.P, S₁, S₂, S₃ are sum of first 15, 30, 45 terms respectively. If S₃ = 300, S₂ = 150 fin | Arithmetic Progression — sums | T-12 Number Series / AP & GP |
| Q100 | There are 7 persons (i.e.) A, B, C, D, E, F, G. They play different games (i.e.) Cricket, Footb | Arrangement puzzle | T-14 Logical Reasoning, Puzzles, Dice |
| Q189 | If side of a square is “x” meter and area of that square is x square meter, then which of the f | Area of a square | T-06 Area (2D Mensuration) |
| Q192 | If (x + y) : (x – y) = 7 : 3 then find the ratio (x^3 + y^3) : (x^3 – y^3) | Ratio of cubes | T-03 Ratio, Proportion & Ages |
| Q194 | If a% of “a” is “a”. Then what is b% of “a”? | Percentage in algebraic form | T-04 Percentage |
| Q195 | If x + y + z = 0 then x^3 + y^3 + z^3 + 3xyz is equal to ________. | Algebraic identity | T-11 Simplification |
| Q196 | In a certain code, if PAY is written as DAE then DIP will be written as ________. | Coding and decoding | T-15 Alpha-Numeric Reasoning |
| Q197 | The next term of the given series is : YEB, WFD, UHG, SKI, ________. | Letter series | T-16 Number Series (Reasoning) |
| Q200 | The three position of a dice is given below Choose figure will be formed when the dice is unfol | Dice — unfolding | T-14 Logical Reasoning, Puzzles, Dice |
What this means for Group 2 and Group 4
Aptitude is the one section where preparation converts almost directly into marks. The syllabus is a short list — interest, percentage, ratio, work, mensuration, series, dice, reasoning — and the Commission keeps returning to it. Sixteen of the 26 questions in this paper had already been set somewhere in our material, four of them with the identical numbers. Nobody can promise that for General Studies. For aptitude it happens every year.
Group 2 and 2A prelims follow on 1 November 2026, and Group 4 in December. Both carry the same Aptitude and Mental Ability section at SSLC standard. The batch below works the whole of it in 25 tests.
Work the whole aptitude syllabus before the next paper
Three ways in, depending on how far along you are.
The solved maths book that carried 11 of these 16 is in the book store.
வினாத்தாள் முழுவதையும் எடுத்துக்கொண்டால் 200இல் 53 வினாக்கள் மட்டுமே ஏற்கனவே பார்த்தவை. ஆனால் கணித திறன் பகுதியில் மட்டும் இந்த விகிதம் 62% ஆக உயர்கிறது. பொது அறிவுப் பகுதிக்கு எல்லை கிடையாது; கணித திறன் பாடத்திட்டமோ சிறியது, அதே தலைப்புகள் ஆண்டுதோறும் திரும்பத் திரும்ப வருகின்றன. எனவே முறையான பயிற்சி செய்தால் இந்த 26 மதிப்பெண்களையும் உறுதியாகப் பெற முடியும். குரூப் 2 / 2A முதல்நிலைத் தேர்வு 2026 நவம்பர் 1ஆம் நாளும், குரூப் 4 தேர்வு டிசம்பர் மாதமும் நடைபெறவுள்ளன. இரண்டிலும் இதே கணித திறன் மற்றும் மனத்திறன் பகுதி உள்ளது.
Also on this paper
Method: every one of the 26 aptitude questions in booklet CCSEI-P26 was read and compared by hand against 83 past TNPSC papers, our Home Test Batch papers, our question bank, the solved maths book and the Samacheer textbook exercises those chapters are built from. TNPSC’s pattern describes 25 aptitude questions; in this booklet 26 questions are aptitude or mental ability by content, and we list all 26. Booklet codes shuffle question order, so numbers here refer to CCSEI-P26.