One random test after food or drink is a bit meaningless really, did you test before your few sips of tea? Did you have milk in it? Was there sugar? I suspect your number probably wouldn’t have been much lower before the tea even if it did have milk.
As your new to testing the advice is to test right before first bite of a meal then 2 hrs after first bite to see what that meal has done to your BG. Forgetting for a moment what your starting number is, though ideally you are looking for something below 7. What you are testing for is the 2hr rise between the two numbers. If it’s 2 or less then that meal was probably ok for you. If it’s more than 2 then you either need to reduce the carbs or cut them all together.
Looking at your other post your just on the cusp of diabetes at 49 so if you reduce your carbs in your meals (not just sugar, all carbs turn to sugar) so things like potato,rice,pasta,bread, flour products you should begin to see a reduction in your numbers
A good testing regime in the beginning to establish what your body can cope with is fasting test - so first thing as soon as you rise then test at first bite and 2 hrs after first bite. Try not to snack and stick to 2 or 3 meals a day, drinks are fine but be aware if you do have milk it does have carbs so although minimal they can add up if you drink a lot of hot drinks.
Hopefully if you reduce your carbs you will start to see your numbers come down