Updated April 12, 2016. These days you may need just a tetanus shot, or a vaccination against tetanus, diptheria and pertussis. Tetanus is a bacterial infection of the nervous system, also known as lockjaw. Symptoms include muscle stiffness, difficulty swallowing, muscle spasms and seizures.
The average MCAT score each year is somewhere around a 24 (8 in each section). A good (competitive at most MD schools) score is around 30 and a stellar score is somewhere above a 34 to 36 (competitive at the top medical schools in the country). A score of 36 or better would put you in the top 2% of the country.
The grading scale has changed where now your score for each section will range from 118 to 132. The AAMC MCAT midpoint being 125. Using these numbers you'll certainly have to have an average MCAT score greater than 125 on each section of the exam to be competitive for medical school admission.