This is a new session with a new set of teachers, for a change every year the students will be put into different sections. All sections are balanced and don't make any difference if it changes.
For Information:
1) Change in sections of students while promotion from one grade to next is an internal administrative process.
2) It is done keeping into consideration many aspects such as the number of students, boy-girl ratio, house allotment.
3) Mixing of students give them ample opportunity to know more students and make new friends.
4) Parents should be relaxed as any such change also helps them to learn adjustment.
So kindly don't bother about it and have any inhibitions. We welcome a student to the new session and best of luck for the start of the new session.