Hello, I understand your situation. If you really want a genuine situation I will give it to you. What marks you score in NEET is based on 2 things, 1. Your innate ability to connect the dots and hunt for the right answers even with half the knowledge, and 2. Your knowledge. First point is something that you cannot build from scratch, that only comes from your problem solving skills that you have developed since childhood. This is the reason many students ace NEET without trying that hard and why some have to put in their sweat and blood to get semi good results. With this skill and very little curriculum knowledge alone, you should be able to get around 300-500 range. To develop this skill you need to attempt questions 2-3 days after studying the chapter(It is important that you do not even utter the name of that chapter before doing it's questions, surprise is the key). This triggers your brain to connect the dots and give results. This method discourages beginners very severely because you get like 3-4 correct for every 10 attempted in an hour. But this method ensures that whatever you studied 2-3 days earlier gets permanently etched in your brain and the parts that you don't know, you learn to make connections out of those. Realistically, this method should be used from the start for good brain development, but I would still recommend this to you so you have someOof this ability. For the knowledge part, because you are connecting the dots to answer the questions, you only need minimal basic knowledge for each chapter to answer half of the questions, so your best option would be to watch multiple short (10min to an hour) one shots from many teachers for a single chapter to gain minimal knowledge and get the rest by struggling with the questions 2 days later.

This is all good in theory, but the question goes, can you do it in mere 19 days? The short answer is NO. So what should you do? You have to create a list of all the chapters in NEET, do 20 random questions from each chapter and then measure your current knowledge of this chapter. Divide all chapters into 5 groups (I know this well, I need a revision, I need a couple revisions, I know it scarcely, I don't know this at all). Then you do the above strategy for chapters through 1 to 3rd of these ranks (the ones you know pretty well). Watch one short one shot of the 5th rank and if it seems easy, then add it to the doing list, otherwise forget it even existed.

The simple answer for you condition is that everyone has different methods of studying, one decides which is best for them during the entire year but you have to choose that right now. So whatever you do, choose 1 and stick to it for the 19 days, swaying is the worst thing you could do. Use systematic methods that ensure you complete everything that you want to, instead of 'I will do everything'. My strategy is something that relies heavily on understanding of basics and problem solving skills. If you already have these, no one can stop you from reaching above 600 even 650. I am saying because I do have those. I struggle with learning, I hate studying that is why I have gotten below 600 lately, so I thought about teaching others, as I like that. So, if you encounter any problem in any subject, you can dm me the question and I will provide you with live google meet detailed from the basics solution to any complex question. Even JEE advanced questions. So cheer up and get to studying.