IMO, do not buy it.
1GB of RAM? Sounds like it's the Tab3 series released in February 2016.
Confusing name - "Lenovo Tab3 7" -
Lenovo Tab3 7 - Full tablet specifications
16GB of on-board storage is nothing. For example, Android Marshmallow (6.0.1) uses about 4.80 GB of space, the remaining will be used by Apps, Media and Cached data, but
you will run out of space.
Lenovo Tab4 8/8 Plus and 10/10 Plus (screen size) have minimum 2GB of RAM, running Android Nougat, and released in 2017.
You may need to spend a little more, but I would look at something with the following specs:
Minimum:
- Screen: 7-inch or higher HD
- RAM: Minimum 2GB RAM
- Storage: Minimum 32GB + MicroSD card
Recommended:
- Screen: 7-inch or higher FHD
- RAM: Minimum 3GB RAM
- Storage: Minimum 32GB + MicroSD card
Optional:
- Flip case with stand
- Tempered glass 9H screen protector
Edit: If you are limited on spending, look at other Android tablets from 2017 and running at least Android Marshmallow. Snapdragon also have a better track record, but I've only used the 800-series on 2 devices.