You can tap the score to view more details, but I calculate it as follows:

Connectivity (20 pts): Online Node: 20 Online Host: 10 Offline: 0

Services (40 pts): Points for each supported feature (Full Node, SegWit, P2P v2, Compact Filters, Bloom Filters)

Blockchain Sync (25 pts): More points for being close to the latest block height

Clock Sync (5 pts): More points for accurate time

Transaction Relay (5 pts): Relay enabled: 5, disabled: 0

Protocol Version (5 pts): Modern version: 5, older/unknown: less