See if you get admission to the dummy school then you will get more time to study for your NEET and along with you will do the preparation of your boards by yourself. Now you will not do the practicals or anything or you will complete the syllabus of practicals before one week of examination. Now if you get NEET then you have to attend labs in MBBS like Pathology etc. Now in that case you will feel nervous as you aren't accustomed to the lab work. Again if you don't get NEET (as you know competition is very hard) then what will you do? You don't have the practical framework. See I am not saying that practical of 11 and 12 are very important but having accustomed to the lab work is important. So if you wish to get in dummy school its of no problem, but if you can join the regular schools. There are also toppers who are from regular schools, they attend weekend classes in coaching and still they are in top medical colleges.

Now the marking scheme of such school are extremely randomized. They just put value based on 10 records as submitted by the student on admission. Overall they will make you cross the eligibility of NEET.

Now its all about your decision.

I hope this answer helps. All the very best for your future endeavors!