RubberDuck helps college students practice coding MCQs, spot bugs, master programming foundations, and build a daily prep habit before campus placements.
RubberDuck is mobile-first, streak-based, and focused only on the coding-round skills that show up in placement exams: output prediction, debugging, missing lines, implementation logic, and time complexity.
Practice a small set of coding questions every day and build a streak without feeling overwhelmed. Five minutes, ten questions, locked in.
Explain why your answer is right before locking it in. This trains real understanding, not guessing your way through MCQs.
Track private company-wise readiness for coding rounds like TCS NQT, Infosys SP, Wipro Elite NTH, Amazon, and more.
Start with programming foundations and move into DSA-heavy practice. Five tracks covering everything Indian campus placements actually weight.
RubberDuck focuses on coding-round preparation. Aptitude, verbal, and reasoning are outside the app, so students can stay focused on programming performance — for the companies that visit your campus.
This is the kind of question that shows up in TCS NQT and Infosys SP coding rounds. The code compiles. It runs. It returns the wrong answer. Find the line.
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1 def average(nums): 2 total = 0 3 for i in range(1, len(nums)): 4 total += nums[i] 5 return total / len(nums)
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