Please see if I'm on the right track with my stats work

1) If I have five psychological test battery scores (would that be independent variables) and want to see which of the five tests would predict higher academic grades (would that be dependent variable)... would I use multiple regression analysis? And should I also do predictive validity (i.e. correlation)

2) There is only 100 participants in the study... would I use stanine scores over raw scores (no demographic info in the data set i.e. gender, age)

3) what does it mean to show the distribution of scores (i.e. would I show a gragh with a normal distribution curve)

Thaks in advance