To save attendance directly into your own Google Sheet, connect it once below. This is a one-time setup per browser/device.
Create a Google Sheet with a first row of headers: Date, Student Name, Time In, Time Out, Batch, Instrument. Copy its ID from the URL (the long string between /d/ and /edit).
In Google Cloud Console, enable the "Google Sheets API", then create an OAuth 2.0 Client ID (type: Web application) and add this page's exact web address under "Authorized JavaScript origins".
Paste the Client ID and Sheet ID below, then click Connect Google Account.
Not connected — attendance will still be recorded here and can be exported as CSV.