depends on the teen, 7th grade usually concentrates on the new testament and the person and mission of Jesus Christ, with a good guide to books of the bible–Fr. McBrides Teen bible guide is one good source–you can do that well at home. you can also use any lectionary-based resource for teens as long as you do a full liturgical year (Advent to Christ the King). That resource will expand on the readings, especially the gospel, invite the teen and the sponsor guiding him (you) to reflect on them and extend the lesson into their own lives, and will have doctrinal content as well. I would ask your parish just to get the lesson plans from a program to which they already subscribe, as individual subscriptions would be pricey, but there are also textbooks.
The Gospel Truth by Kenneth Ogorek is one but intended for adults, but under your guidance, with a good supporting catechetical text, you could do very well.
I second the Amy Wellborn books, get her teen bible as well, the “inserts” and sidebars are great.