Will I be able to complete …

I'm in 12 class and I'm making a plan that how to complete my syllabus before August so that I can also do plenty of questions for neet so that's why I was asking if I decide to come 4 chapters in 20 then will I be able to complete my syllabus and will be ready to do questions of the chapter as much as I can

If you had concentrated in the class, you'll be able to catch up something like minimum 2 chapters.Maximum number of chapters which you will cover up depends on your dedication to your study hours.Eg:If you study for 2-3 hrs with maximum concentration, you'll pick up everything easily.But a study duration of 6-7 hrs with distractions is an utter waste of time(That doesn't mean that you shouldn't study for 6-7 hrs....If you study for 6 hrs daily with complete concentration,it won't feel tough).Also,it depends on the length of the chapter.If you are preparing for an upcoming exam,I think you should finish up all the small chapters so that you can attempt questions from those chapters at least...So I think that 4 chapters can be easily completed that too, within a duration of 20 days,if done with full concentration(PS: These are applicable if you had attended the classes of those chapters only,else,you should dedicate extra time for listening to the class online or something like that....)