好 =85-100 良好 = 70-84

If you ask "when should I use 良好 instead of 好", here are the examples for your reference: 1. How's the ice cream? It's good = 好 (for food, nobody use 良好 to describe the delicious food) 2. How's the book? It's good = 好 = 良好 (for stuff, most of the ppl admire the stuff by using 良好 instead of 好, but you can still use 好 if it's accpetable in benchmark.) 3. Will you come with me? Ok = 好 (for Yes or No)

It depends on language environment 好 is very broad and general, could be used in many places depicting different meanings. 好的--It's ok 你好--hello 好样的--pretty good 好像--likely; ...seems... Usually we don't use 好 without a prefix or suffice. Instead, we use “非常好”---Excellent 很好--Very good 良好--good e.g. 我感觉良好 I feel good or I feel ok depends on context

When you say something is noun ,you can use them like this ，noun+良好，such as 情况良好，表现良好，and，verb+得+好，such as 干得好

“良好”和“好”的区别相当于英语中的“OK”和“FINE", 显然，“好”比“良好”所表达评价更高