if(elective_human):
                    elective_human = list(set(elective_human) - set(all_courses_tillnow))
                    num_to_select = 1  # set the number to select here.
                    list_of_random_items_human = random.sample(elective_human, num_to_select)
                    CurrentSemester.extend(list_of_random_items_human)

                length = 0
                elective_pre = []
                tempElect = []
                temptempElect = []
                while(length < 2 and elective_course):
                    elective_course = list(set(elective_course) - set(all_courses_tillnow)- set(tempElect))
                    num_to_select = 2 - length  # set the number to select here.
                    list_of_random_items_human = random.sample(elective_course, num_to_select)
                    elective_pre.extend(list(list_of_random_items_human))

                    for row in elective_pre:
                        pre = set(Prerequisite_Course.loc[Prerequisite_Course['Course'] == row]['Prerequisite'])
                        condition = all(x in all_courses_tillnow for x in pre)
                        if not pre:
                            temptempElect.append(row)
                        elif(condition):
                            temptempElect.append(row)
                        elif(not condition):
                            pre =list(pre - set(all_courses_tillnow))
                            temptempElect.extend(pre)

                    temptempElect = (list(set(temptempElect)))
                    for (j,row) in enumerate(temptempElect):
                        if temptempElect[j] not in elective_course:
                            temptempElect.remove(temptempElect[j])

                    tempElect.extend(temptempElect)
                    length=len(tempElect)
                    elective_pre = []
                    temptempElect = []

                elective_course = list(set(elective_course) - set(all_courses_tillnow)- set(tempElect))
                CurrentSemester.extend(tempElect)