Tarleton State University grants credit for IB higher level exams with a score of 5 or higher and for some standard level exams with specified scores of 5 or higher. A list of credit equivalents and required scores is on the testing site for certain higher level and standard level exams.
Per stirpes distribution or right of representation refers to children/child of the decedent, or their heirs. If the child that was an heir passed away before the parent but they left behind a child/children then that child/children will inherit in the place of the parent that died before the grandparent.
Dividing by per capita or per stirpes: If the residue is to be divided per capita, each person gets an equal share, no matter what the relationship to the decedent. If the residue is to be divided per stirpes or by right of representation, you divide it equally at each generational level, with any issue of a deceased person to take his or her share. Although you can make partial distributions of residuary, such partial distribution is by no means required.