Infosys Placement Prep: Priority Concepts and Most-Repeated Questions

The Infosys online test covers four sections, but percentages, number series, and syllogisms are the three topic types that appear most consistently across SE and SP hiring cycles.

This guide is the placement-prep playbook, not a section-by-section question bank. For full worked solutions across all four sections, see the Infosys aptitude test guide. For the complete three-stage selection walkthrough, see the Infosys interview guide for freshers. This article covers the concept priority list, a 4-week study plan, and five high-frequency worked examples.

How the Infosys online test is structured

The online test runs across three sections for SE candidates and four for SP and PP candidates:

Section	SE track	SP and PP tracks	Approximate questions
Mathematical ability	Yes	Yes	15
Reasoning ability	Yes	Yes	15
Verbal ability	Yes	Yes	20
Pseudo-code	No	Yes	5

Timing and exact question counts vary by hiring cycle. The section structure above is consistent across recent drives. The pseudo-code section is the primary differentiator between SE and SP selection.

Priority concept list by section

Not every topic deserves equal prep time. The rankings below reflect frequency of appearance across Infosys placement papers from recent SE and SP hiring cycles.

Mathematical ability

• Rank 1: Percentages and profit/loss. Appears in every mock and placement paper catalogued by FACE Prep. It also feeds into successive-discount and interest questions, so mastering it pays off across multiple question types.
• Rank 2: Time, speed, and distance. Trains, boats, and relative-motion questions typically account for 2 to 3 questions per sitting.
• Rank 3: Number series. Six core pattern types cover the majority of what appears. The number series guide has 12 solved questions across all six patterns.
• Rank 4: Averages and ratios. Often combined in a single question. Straightforward once the formula is automatic.
• Rank 5: Pipes and cisterns. Lower frequency, but appears often enough to warrant one focused session.

Reasoning ability

• Rank 1: Syllogisms. The Venn-diagram method solves every standard type in under 30 seconds once practised. See the logical reasoning guide for a full walkthrough.
• Rank 2: Blood relations. Drawing a family tree for each question eliminates the guesswork that kills time.
• Rank 3: Coding-decoding. Alphabetical-shift and mirror-image patterns; a fixed checklist makes these mechanical.
• Rank 4: Statement-conclusion. Tests premise-to-conclusion logic; 2 to 3 questions per sitting.
• Rank 5: Data sufficiency. Lower frequency but worth one session, especially for SP-track candidates.

Verbal ability

• Rank 1: Reading comprehension. Passage-based questions require both speed and elimination; the answer is almost always in the text, not in prior knowledge.
• Rank 2: Sentence completion. Vocabulary-light; context clues carry the answer in most cases.
• Rank 3: Error identification. Grammar patterns around subject-verb agreement and tense consistency cover most question types.

Pseudo-code (SP and PP tracks only)

• One priority: trace by hand. No language syntax is tested. What matters is correctly tracking variable state through if-else blocks and while or for loops, iteration by iteration.
• Start with single-loop traces, then move to nested conditions. Three to five practice blocks per day over two weeks builds the speed the timed section requires.

A 4-week study plan

Week	Focus areas	Daily time
Week 1	Percentages, profit/loss, time-speed-distance	1.5 hours
Week 2	Number series, averages, ratios; syllogisms, blood relations	1.5 hours
Week 3	Coding-decoding, statement-conclusion; verbal (RC and fill-in)	1.5 hours
Week 4	Pseudo-code for SP/PP candidates; two full timed mocks; weak-area review	2 hours

Run one timed full mock after Week 2 and one after Week 4. Do not run mocks before Week 2: the concept foundation needs to be in place for mock results to carry diagnostic value.

Five worked examples from high-frequency question types

Example 1: Time, speed, and distance

• Q: Two trains start from cities P and Q, 360 km apart, traveling toward each other. Train P travels at 72 km/h and Train Q at 48 km/h. After how many hours do they meet?
• Step 1: Combined approach speed = 72 + 48 = 120 km/h
• Step 2: Time to meet = 360 divided by 120 = 3 hours
• Answer: 3 hours

Example 2: Successive discounts

• Q: A laptop is priced at ₹60,000. Shop A gives a flat 25% discount. Shop B gives 15% off and then an additional 12% off the reduced price. Which shop is cheaper, and by how much?
• Shop A: 60,000 multiplied by 0.75 = ₹45,000
• Shop B, step 1: 60,000 multiplied by 0.85 = ₹51,000
• Shop B, step 2: 51,000 multiplied by 0.88 = ₹44,880
• Answer: Shop B is cheaper by ₹120

Example 3: Number series

• Q: Find the next term: 2, 5, 10, 17, 26, 37, ?
• Difference sequence: 3, 5, 7, 9, 11 (odd numbers increasing by 2 each step)
• Next difference: 13
• Answer: 37 + 13 = 50

Example 4: Syllogism

• Statements: All cats are animals. All animals have hearts.
• Conclusion I: All cats have hearts.
• Conclusion II: Some animals are cats.
• Analysis of I: All cats fall inside the animals set (premise 1); all animals have hearts (premise 2); therefore all cats have hearts by transitivity. Conclusion I follows.
• Analysis of II: Since all cats are animals, the cats set sits inside the animals set, so at least some animals are cats. Conclusion II follows.
• Answer: Both conclusions follow.

Example 5: Pseudo-code trace

• Code block:

  x = 10
  y = 3
  while x > y:
      x = x - y
      y = y + 1
  print(x, y)

• Iteration 1: x = 10 is greater than y = 3 (True). x becomes 7, y becomes 4.
• Iteration 2: x = 7 is greater than y = 4 (True). x becomes 3, y becomes 5.
• Iteration 3: x = 3 is greater than y = 5 (False). Loop exits.
• Answer: print(x, y) outputs 3 5

What happens after the online test

The aptitude test is the first filter. After clearing it, SE-track candidates face a 30-to-45-minute technical interview followed by an HR round. SP-track interviews add heavier DSA coverage. The Infosys fresher interview guide covers the full three-stage process, including OOP and DBMS question lists, branch-specific prep for ECE and EEE candidates, and HR round strategy.

Short version: after the online test, prepare to explain your most recent project clearly (problem, tools, what you would change), and practise writing 15 to 20 lines of pseudocode on paper. Logical correctness matters more than syntax correctness in the technical round.

AI-attuned skills and Infosys packages

In Q4 FY26 earnings commentary, CEO Salil Parekh confirmed that Infosys now offers different starting compensation for candidates with skills attuned to AI and is building a pool of forward-deployed engineers to work directly with clients on AI solutions. Infosys onboarded 20,000 freshers in FY26 and plans to match that number in FY27.

For placement prep, this changes the picture at the margin. Clearing the online test with the five question types above gets you through the SE filter. Candidates who combine that aptitude readiness with documented AI-application skills are positioned better at the starting-pay level.

The InfyTQ platform is the formal certification signal Infosys references for SP and PP track shortlisting. AI and advanced-track certifications there are one visible indicator the selection committee looks for beyond the aptitude score.

The 4-week plan in this guide handles the aptitude layer. For the AI layer, the 2026 AI roadmap for Indian engineering students maps which skills to add and in which order. TinkerLLM at ₹499 is a low-commitment entry point for hands-on AI project work.