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  1. Certification Tests

Java (Intermediate) Certificate

Nikolay Fedorov's HackerRank Certificates

Certificate: Java (Intermediate)

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Certificate: Python (Basic)

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Certificate: Java (Basic)

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Certificate: Python (Intermediate)

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Certificate: Python (Advanced)

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Certificate: Problem Solving (Basic)

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Certificate: C++ (Basic)

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Certificate: C++ (Intermediate)

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Certificate: C++ (Advanced)

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Java (Intermediate)

It covers topics like Multithreading in Java, Working with Networking in Java, and Collections and Serialization.

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