"good" is an adjective, and "well" is an adverb. Use "good" with nouns. For example, good car, good book, good job, good food, etc. Use "well" with verbs. For example, works well, runs well, speaks well, etc. So, use "as good as' with nouns. For example, "My car is as good as yours.", "My new job is not as good as my old job". And use "as well as" with verbs. For example, "you speak English as well as I do", or "I want to speak Japanese as well as you do".