Many children get anxious starting a new term but he,lp is at hand. Genie Rowson has written an excellent article on using homeopathy to counter school anxiety.
Another possibility is to use Indigo remedies - these remedies are specifically designed for children and are safe and effective - there are several that might apply for the school jitters - Confidence, Happy, No Fear - read more about the Indigo essences and make your choice.