In general, first to qualify in NEET, a General Category candidate has to score 50% of the top NEET score. It is 40% for SC, ST, OBC. For example, if the top NEET scorer has scored 500, General Category candidates should score atleast 250 and SC,ST,OBC should score around 200 to qualify. Now not every qualified candidate can get a medical seat. It depends on cut offs. Now cut offs change every year and are dependant on various factors like no.of seats available, no.of candidates appearing for the exam, difficulty of the exam and top NEET score. Every State except Jammu and Kashmir has All India Quota and State Quota and there is different cut off for each quota. Now every State has various cut offs for every college and Category. Tamilnadu is one of the States with highest cut off. But States like Assam do not have that high cut off. So it totally depends on what State you want to apply and if you want to apply under All India Quota or State Quota. State Quota has higher cut off marks. For Tamilnadu, it should be atleast 625. But for Himachal Pradesh it is around 300. And you cannot be eligible for State Quota of every State which means you should also try for All India Quota. But without having an idea of which State you want to apply for, it is difficult to guess your chances. For example, with the cut offs that Tamilnadu has, one can easily get a seat in a Govt. Medical college in West Bengal.
With this score you wont get a government seet
But can try a private one
with regard to your query regarding admissions to BAMS in VPSC Ayurveda College, Kottakkal, please note that 45 seats are offered by the college to the Office of the Commissioner for Entrance Examinations (CEE), Kerala, which conducts admissions to these seats on the basis of scores obtained by candidates in the National Eligibility cum Entrance Test (NEET). NEET is conducted out of 720 marks and candidates clearing the exam are placed in an All India Merit List, which each state uses to create its own State Merit List. The CEE, Kerala, uses separate State Merit Lists derived from the NEET Merit List to finalize admissions to the available seats in colleges offering MBBS and Allied courses in the state of Kerala. Through NEET 2017, candidates for BAMS in Kottakkal College were selected for admissions under 11 different categories including State Merit (Open/General), Ezhava (EZ), Muslim (MU), Other Backward Hindu (BH), Latin Catholic and Anglo Indian (LA), Dheevara and related communities (DV), Viswakarma and related communities (VK), Kusavan and related communities (KN), Kudumbi (KU), Scheduled Castes (SC) and Scheduled Tribes (ST). The last NEET 2017 All India Ranks (AIR), last Kerala State Ranks for Allied courses (SR) and NEET cut off score out of 720 for each category to secure a seat to the BAMS course at VPSV Ayurveda College, Kottakkal, are as given here - Under SM Category: AIR 27,377, SR 3952, NEET Score 497; Under EZ: AIR 36,789, SR 5092, NEET Score 474; Under MU: AIR 30,580, SR 4341, NEET Score 489; Under BH: AIR 34,643, SR 4821, NEET Score 479; Under LA: AIR 40,495, SR 5580, NEET Score 466; Under DV: AIR 50,137, SR 6650, NEET Score 447; Under VK: AIR 34,404, SR 4785, NEET Score 479; Under KU: AIR 3,15,379, SR 28,998, NEET Score 211; Under KN: AIR 2,33,632, SR 23,037, NEET Score 257; Under SC: AIR 1,24,148, SR 14,053, NEET Score 346; Under ST: AIR 3,98,605, SR 34,601, NEET Score 176. Securing a position within the given ranks as per your category should enable you to get BAMS admission in Kottakkal Ayurveda College. Hope this helps!