ajohn

1. The one at the front is a juvenile Oriental Pratincole (non-breeding is similar but more uniform on the upperparts).
2. Yes, Curlew Sandpiper, Terek Sandpipers and a Great Knot.
3. Yes, the bird at centre is Lesser Sand Plover, it looks like atrifrons-group.
4. The birds on the left look like Red-necked Stint and Sharp-tailed Sandpiper.