Yes, although technically you could also say correcter, since the rule is that English adjectives take -er in the comparative, no matter how many syllables they may have. But another, unofficial rule is that adjectives from Norman French, such as correct, tend to take the French construction in the comparative, which is with "more."
If you're worried about "correct" being an implied superlative - something is correct or it isn't- don't be. This is English, not Latin.
The second one is more correct.
"That was wrong" is a grammatically correct sentence.
Yes, Almighty God is grammatically correct.
Yes, it is grammatically correct.
Yes. The form who is the nominative, as opposed to whom.
No. Him and me is correct.
I am, you are, he/she/it is, we are, they are.
The phrase "how don't I" is not grammatically correct. A more correct way to phrase it would be "why don't I."
Yes, it is grammatically correct to say "this date and time is good for me" when referring to a specific date and time that works for you.
The phrase "do good to everyone" is grammatically correct, but it may be more commonly expressed as "be kind to everyone" or "treat everyone well."
No.
The grammatically correct response to "How are you?" is typically "I'm good, thank you," or "I'm doing well, thanks."
yup...
No, "most friendly" is not grammatically correct. The correct form would be "friendliest" when comparing three or more things.
good at studies
No, more better is not correct. Better is the comparative for the adjective good; best is the superlative and should be used instead of 'more better'.
Yes