hello bhumika......

yes it is little bit difficult but you can crack neet with 400 marks in just one month

first make a plan so that you can get little bit analysis about the syllabus now according to that you start preparing for your exam by managing the time

divide your day into three halfs equally so that you can manage all the three subjects in a day finish timetable you have given by evening and revise the topics again which you have read and also have a look on the previous papers

i hope this information is helpful

all the best.