M7.5 How to make cement mortar test blocks and use them for masonry?

Look at the ratio of sand: cement: water according to the mixture ratio, and then mix sand, cement and water into mortar with a scale. Then use mortar test block mold to form, dismantle the mold one day later, put it in the shade and pay attention to water conservation, and then send it for inspection 28 days later. Pay attention to adding a little more cement after taking the materials in proportion. If you want to send it for inspection, you must have a higher strength.