How much to score in 12th for this
A Search Engine Optimization ( SEO ) Specialist analyzes, reviews and implements changes to websites so they are optimized for search engines. This means maximizing the traffic to a site by improving page rank within search engines.
There is no such minimum marks needed to be a SEO specialists, you need to have bachelor degree in marketing, Communication, Commerce, business or Information Technology and and you should have knowledge of HTML and other programming like CSS