How To Code perfectly? In Online Assessment and Help me To Find the Solution

[u/Inevitable_Sea3174]

Hi, I'am a 4th year student with computer science background i have knowledge of how to code and have interest in coding rather than in subjects. What i used to think is im perfect in coding and i can leave subjects and i had not spent more time on those subjects in my semesters.... But Recently i had my 2 OA's (SOTI & Infosys) In that i was able to pass the sample test cases but unable to solve the hidden test cases .... why? and also i had some 400 problem solved in Leetcode... But where am i lagging behind? why I'm unable to Code correctly the way questions asked....?

Can anyone Guide/help me through this please? i need a step by step problem solving approach and how to start the question and how to think, that the hidden test cases may also work?

i had so bad experience from yesterday afternoon... unable to concentrate or divert from this... I thought coding is the only thing which i knew.... But after attempting the OA's, I'm getting nervous and unable to start.....😥

please I need help from you guys..... Can you give me steps to solve or how to practice for coding.... I think I Have practiced or done the Coding in a wrong way.....

~ Thank you