Increasing score from 189 to 600+ is tough, especially when you are doing self study.
But I suggest that you can take subscription of Physics Wallah Yakeen batch and study according to their schedule. They take mock tests every 20 days.
Remember one thing coaching is for only right guidance. You have to do study by yourself to crack neet.
Be consistent throughout the year. Don’t procastinate. And your syllabus should not be extend NCERT.
First you clear all your concept and practice mcqs thoroughly when you finish your lesson. Many students score less mark due to lack of practicing questions. And when you cover your whole syllabus give 720 marks mock tests 3 times a week.
Be confident. And don’t loose your hope.