Since it was a regular medical checkup, I assume you don't have any specific symptoms.
It will be best if you provide the actual values of the 3 to make sure if you actually have deficiency.
You can safely take the following supplements for the deficiencies.
1.
Vitamin D - Uprise D3 60,000 IU- once a week for a month and then continue once a month
2.
Vitamin B12- Becosule Plus once a day at night for a month
3. You can increase your
calcium intake in your diet by having milk, almonds, avocados, seasame seeds etc.
Next Steps
Follow up after 3 months with reports