1. The plaintiffs are Ding and E's parents and Xiao A. As close relatives of the victims Ding and E, they can claim compensation for the death of the victims. Among them, Ding's parents are close relatives of the victim Ding, and Wu's parents are close relatives of Wu. Defendants include driver A, test drive driver B or their employers and units. Driver A, as the infringer, should bear the tort liability, and test drive driver B, as the commander, has the obligation to remind and supervise customers to drive safely and legally. If the driver is speeding at the school gate, and Party B is at fault, it shall bear part of the liability for compensation. If he is employed by his employer, his employer or unit shall be liable for compensation.

2. This case can be under the jurisdiction of tianqiao district People's Court or the court where the defendant is domiciled, because this case should be under the jurisdiction of the basic people's court. The civil procedure law stipulates that cases of traffic accident damages shall be under the jurisdiction of the people's court where the accident occurred (where the infringement occurred) or where the defendant lived. In this case, the defendant is not a single defendant. In order to facilitate litigation, the plaintiff should choose to file a lawsuit in the court where the accident occurred. Therefore, it should be under the jurisdiction of the People's Court of tianqiao district, Jinan.

3.( 1) belongs to material evidence; (2) It belongs to witness testimony; (3) It belongs to documentary evidence; (4) It belongs to witness testimony.