See..i too prepared for neet without coaching and scored 651 so i think i could be of some help to you:-)
Long one ahead….:-D
First i was from ISC (11th and 12th)..so the concept of Ncert was very new to me.I started reading bio ncert after my 12th boards last year.Due to covid exam got postponed and so i decided to study something for my first attempt.I read bio ncert and watched Dr.Anand mani’s one shot videos on unacademy (free) and kept revising.For physics i made notes religiously from the crash course (free) on NEET PHYSICS KOTA youtube channel.For chem,i read chapters like biomolecules,surface chem,chem in everyday life to score and since i had given my boards (though isc) i had ideas of physical chem’s formulas. So this made me score 437 in neet 2020 with an AIR of 1.5lakh. I too had joined Neetprep achiever batch test series for giving tests