<ul data-eligibleForWebStory="false">An individual reflects on Day 13 of a 100-day coding challenge.The individual completed studying the Big Data syllabus for an upcoming exam.They expressed relief and hope for a successful exam.The individual started a project on a URL Shortener with Ruby on Rails.They installed PostgreSQL and created an initial model file.Planning to gradually develop the project with additional features.The individual aimed to maintain productivity without overwhelming themselves before the exam.Expressed sadness over a plane crash in Ahmedabad and offered support to those affected.Hoping for a better tomorrow.