MBBS is just the beginning of a never ending medical education and in India after MBBS you only fetch 50k to 80k max per month in Government setup so Post graduation is mandatory .
As you said you wanna be a Doctor then paying donation for your ambition is totally worth but…
In these private institutes passing MBBS requires very less input from students as they all are pushed through profs but it depends upon individual capacity and will to study as much even in Pvt institute so to bridge the knowledge gap (which is a hell lot) amongst medicos of other universities . So do give a thought to this .
Lastly answer to the last part of your question depends upon your efforts .How much efforts you can put and sustain that put throughout MBBS course (5.5 years )and then get post graduation seat in government college . It can be very tough.
(You didn't mention if you have dropped or not but if no then just give one more year to prepare for NEET , Drop sucks but usually works)
Dr.Nikhil Wadhawan, Post Graduate in General Surgery at I.M.S & SUM Hospital (2018-present)
Source: Quora Digest