Wait listed for Howard university need help!!!!

1.What percentage of  students get accepted from the wait  list?

2. I havent sent in my first semester senior grades.I applied with a 3.2 weighted g.p.a but my first semester senior grades improved dramatically to a 3.8 unweighted and a 4.o weighted. Do you think this will help me get accepted?

3.Should I send letters to Howard to show them that I'm interested?

4.What can I do to better my chances of acceptance.

5.How long will it take to find out if Im off the waiting list?

6.Anyone is, or has been in this same experience?What was the outcome?