Nice question buddy , its not that you cannot crack neet in first attempt , i have known many friend of mine you have crack neet in a single attempt. Its just that you have do a double hardwork .

Firstly check the whole syllabus of NEET  then  made a time table  , its the most important part , then try to give all the three subject equal preference . Try to check it out in which topics you have to work more harder and need more practice . Also my request that don't just jump off to the past 10 years question paper without not understanding  that particular concept or the chapter , you should completed your whole syllabus first then only start doing the past question papers . For the question paper I would suggest that after completing your syllabus you should practice daily at least 2 question paper also you have to little strict with yourself , every question paper should be devoted 3 hrs atleast with no time gap , you should kept in mind that its your neet paper and you only have 3 hrs so be practical and try to do the question paper in 3 hr and then check out where you are lagging behind and in which topics you are strong.

If you follow this type of pattern you are gonna crack NEET in first attempt only.