When are you testing? Random tests won't help you. You need to test immediately before you eat, then again 2 hours after your first bite. Look at the difference between the 2 readings. If it is above 2mmol/l there is something in that meal that your body isn't coping with and needs either avoiding or reducing in portion size. This is something to aim for at the beginning. As you learn which food are OK or not OK you can aim for less than a 2mmol/l rise. Keep a food diary (including portions of carbs) and record your levels alongside this. Soon a pattern will emerge and you will begin to see what different foods are doing to you.
The NICE guidelines for Type 2's says
before a meal between 4 and 7
2hrs after under 8.5
However, these are a bit too generous, and generally speaking it is better to aim for under 6 before meals and under 7.8 at 2 hours, or even lower. The lower the better.