ratios

hello, i am new at growing, so i m confused with nutrient ratios. i am going to use advanced nutrients 3 part micro grow bloom set, it says i should use 1 : 1 : 1? is it okay to use same ratio whole grow? can i use just grow and micro for veg , bloom and micro for flowering? or should i use 3...

So basically I've got some bloom booster and wondering what you guys think of it. 4% Phosphate, 9% Soluble Potash, .003% Boron, .00007 Copper, .00007 Manganese, .00007 Zinc. Would this be any good in flowering stage? Any advice would be good :)