With around 645 marks in this year's NEET, can I expect a seat in KGMU, Lucknow with UP state quota (UR)?

During 2019, the cutoff for general category through UP state quota was 637 marks for KGMU. Based on this data, there is a possibility of your admission into this college. 

However, the cutoff varies each year, depending on the participating students and the paper level. If things don’t work out, you can go for mop-up round. In it, with 645 marks, there is a good chance that you’ll get KGMU. Otherwise, you can look for other UP colleges like RML, GSVM, GIMS, etc. These are worth considering too.