Hi Aman!! Hope you are doing well!! According to me,it completely depends on you how well and properly you prepare for NEET.Allen material with mtg book are totally sufficient for preparing for NEET. But you need to study all the materials thoroughly and read each and every chapter and concepts.Practice as many problems as we can and study them properly.For more help,you can atleast read Ncert books completely.

Hope it helps.

Feel free to ask your doubts in comment section.