If sugar levels are at the border lines then decrease your intake of sugar and if your sugar level is below 100 like in 70s and 80s you should increase your intake.
And remember just a Single test is not enough, get atleast 2 tests done, 1 while fasting and 1 in Random.
If you dont have any machine at home then you may get it done by any laboratory, just tell them to use a Disposable syringe, double check its packing yourself !