High cholesterol

I have had my annual check up i am on statins for high chlostrel i think my bad chlostrel is high and am at risk of type 2 diabetes but dont really understand my results shown below for triglycerides are they really high will exercise and diet help
Coded entry - Serum triglyceride levels (XE2q9) 2.03 mmol/L [0.5 - 1.7] - Above high reference limit
Coded entry - Serum cholesterol/HDL ratio (XaEUq) 3.5 mmol/mmol
Coded entry - Serum non high density lipoprotein cholesterol level (XabE1) 3.59 mmol/L
Coded entry - Serum cholesterol level (XE2eD) 5 mmol/L; Refer to shared care dyslipidaemia guidelines; for investigation and management.; www.uhdb.nhs.uk/shared-care-pathology-guidelines
Coded entry - Serum HDL cholesterol level (44P5.) 1.41 mmol/L [1.17 - 1.81]
Thanks in advamce