I would be delighted to assist you with completing levels 300 to 600 on the Matific math app for your 5-year-old. My experience as a tutor for young children has equipped me with the patience and understanding needed to work effectively with educational content designed for their age group. Additionally, my strong background in mathematics and English, as reflected in my diverse professional experiences, ensures that I can navigate the app efficiently and adhere to the rules while completing the required levels. I am confident in my ability to meet the three-day deadline and will provide clear documentation, including screenshots of completed levels, as requested. Thank you for considering my application; I look forward to contributing to this project!