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OA Prep Guide

Amazon Online Assessment Prep Guide 2025

Crack Amazon's OA for SDE roles — Work Simulation, Coding round breakdown, DSA focus areas, and a 6-week plan.

~2 hrs
OA Duration
2
Coding Problems
30+ LPA
Package
Hard
Difficulty

Amazon's 16 Leadership Principles

Every Amazon decision — including hiring — is filtered through Leadership Principles (LPs). The Work Simulation section tests LP alignment. Key ones for freshers: Customer Obsession, Dive Deep, Bias for Action, Deliver Results, Learn and Be Curious, Earn Trust. Read all 16 LPs and understand their nuances before the OA.

Amazon OA Breakdown

1

Work Simulation

~50 Qs35 min
Work-style preference questionsPriority & judgment scenariosTeam and stakeholder situationsAmazon LP-aligned situations

Tip: Align every answer with Amazon's 16 Leadership Principles. There are no trick answers — be consistently LP-aligned. Don't rush; consider each scenario carefully.

2

Coding Round (2 problems)

2 Qs70–90 min
Arrays & HashingSliding WindowBinary SearchGraph / BFS / DFSDynamic ProgrammingTrees & Recursion

Tip: First, understand the problem fully before coding. Write a brute force first, then optimize. Test with edge cases before submitting.

3

Reasoning Game (some tracks)

2 games15 min
Logical pattern matchingSpatial reasoningMemory sequences

Tip: These are psychometric games. Stay calm — they measure cognitive style, not knowledge. Practice similar games on Criteria Corp or Pymetrics.

Amazon DSA Priority List

Must Know

Arrays & Two Pointers

Two Sum, Subarray Sum, Rotate Array

Must Know

Hashing & Frequency Map

Top K Frequent, Group Anagrams

Must Know

Sliding Window

Maximum Subarray, Longest Substring Without Repeat

Must Know

Binary Search

Search in Rotated Array, Find Peak Element

High

Trees & BST

LCA, Level Order, Validate BST

High

Dynamic Programming

Coin Change, LIS, Edit Distance

High

Graph (BFS/DFS)

Number of Islands, Word Ladder

6-Week Amazon OA Study Plan

Week 1–2

DSA Foundation

Arrays, Hashing, Two Pointers, Sliding Window — 3 problems/day

Week 3–4

Trees, Graphs, Binary Search

Level Order, BFS/DFS, Binary Search variants — 3 problems/day

Week 5

Dynamic Programming

Top 20 DP patterns — coin change, LIS, edit distance daily

Week 6

Mock OA + LP Prep

Full Amazon OA simulation, read all 16 LPs, prepare STAR stories

Practice DSA for Amazon on TomoLink

Curated aptitude and technical questions, plus company-specific interview prep — all free on TomoLink.

Amazon Interview Questions

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