Hello ,my son has got 438 marks in neet ,we belong to taminadu & mbc category.He will get mbbs seat in stanley or kilpauk medical college

For mbc category as per your query Stanley medical college had cutoff -411 and kilpauk medical college had cutoff -393 in the previous year.According to the previous years cutoffs he will get into these colleges with his score.In fact he will get other medical colleges as well as most of the cutoffs are around 350 marks for mbc category.
Having said that every year the trends change every year based on question difficulty, number of students applied etc. Visit this website for details.
https://medicine-careers360-com.cdn.ampproject.org/v/s/medicine.careers360.com/articles/neet-cutoff-tamil-nadu/amp?amp_js_v=a2&amp_gsa=1&usqp=mq331AQA#aoh=15615537543173&amp_ct=1561553763599&referrer=https%3A%2F%2Fwww.google.com&amp_tf=From%20%251%24s&ampshare=https%3A%2F%2Fmedicine.careers360.com%2Farticles%2Fneet-cutoff-tamil-nadu