Need confirmation on below medicines.

Hi doctor, my father is heart patient done bypass surgery 12years back now under medication he is fine. He is having sugar as well previously he is taking different sugar tablets and insulin 40 morg and 35unit night, now during health check up doctor suggested to take below tablet and insulin. 1) Galvus met 50/1 gm 1-0-1 after food 2) Diamicron xr 60mg tablet 1-0-1 before food 3) Volix 0.3 tablet 1-1-1 aft food 4) Human mixtard 100 iu/ml (30 unit morg and 30unit night)   Tested sugar level it's 186 fasting and 245 after meal. My question is is this safe to continue the above medicine? Please confirm doctor. Note: previously he suggested above tablet with 10 unit insulin for morg alone, but sugar was very high fasting 315 and postprandial 340 so he changed 30 unit insulin for both morg and night.