Trade in values of iPhones, purchase of an iPad

This is a user-to-user technical support site operated by Apple. Go here -> Apple Trade In - Apple to get estimates of what all your devices will be worth. I can tell you the 5s and 4 are not worth anything buy Apple will recycle them for you and the badly damaged iPhone 8 will have no value.

Education Pricing and Student Discounts - Education - Apple

See this link for information on trade-in. Apple Trade In - Apple

See this for information regarding education pricing. Education - Apple I believe they will only take on device for a trade-in, but you can get a gift card for other devices to my knowledge.

The 4 and 5 models have no value.

The se has some value as parts.

The one good 8 could be worth $150 to $160.The other two 8 models have no value.

The SE can net them $25.