How much SAT Essay matters?

<p>My son got his SAT I results yesterday. Overall 2300
Reading 740
Math 790
Writing 770 (Mutiple choice 80/80 Essay 8/12)</p>

<p>He got a good Writing score but his score on Essay was poor.</p>

<p>He plans to apply to Top Tier schools.</p>

<p>How much weightage do schools like MIT , Harvard, Princeton give for the SAT Essay?</p>

<p>Appreciate your opinions especially if you are in know of admission process at these top schools or have personal experience </p>