In reply to Chong Yin Leng.
You can use the full 10% downpayment with CPF. For more information, you can refer to this article https://www.99.co/singapore/insider/everything-guide-payment-timeline-bto-flat/
As for the grant, you can get up to $25,000 with an income range of $2,001 to $2,250, or up to $22,500 with an income range of $2,251 to $2,500. You can read more about it here https://www.hdb.gov.sg/residential/buying-a-flat/new/schemes-and-grants/cpf-housing-grants-for-hdb-flats/single-singapore-citizen-scheme
