Thanks for the A2A…
Any exam is not cracked within a short time, u can only enhance your rank. People who get top 10 ranks in NEET/JEE are usually olympiad medalists , NTSE scholars etc. So cracking any +2 level exam requires minimum basics till class 10. If u can find roots of any quadratic equation, solve simultaneous linear equations , know the names of different organelles in a cell, know the method to find square root by division method, know how to write simple chemical formulae of compounds , know how to balance an equation etc — it indicates that you have got some basics till 10th.
Now can u crack NEET 2019 in 6 months? — YES, provided you have the above mentioned basics.
I am assuming that you have studied nothing before, and I m considering 520+ marks in NEET as cracking the exam.
6 months is a short time, if I were you I would divide this into 2 parts – Part A and Part B. Part A will be reserved for learning concepts and it will be extended for 5 months. Part B will include a month that will be used for revising things from Part A.