Grammar related questions - English Language & Usage

I am a little confused about these sentences. Would love to have your help. Thank you...

If possible then please tell then why the other option(s) isn't correct,

Q1 - If you ____ you would succeed.

a) works hard

b) worked hard ( correct. But why? )

c) had worked hard

d) work hard ( why this one isn't correct? )

My opinion: "would succeed" shows that the sentence isn't of past but is of future or present.. Therefore, I think it would make more sense to use "work hard" instead of "worked hard".

Q2 - He cried as if he _____ mad.

a) had been ( correct. But why? )

b) was ( why this one isn't correct? )

c) is

d) will be

My opinion: Shouldn't it be, "He cried as if he were mad"?

Q3 - He ___ himself while running.

a) hurted

b) had hurted

c) hurt ( correct but why? )

d) hurts ( why this one isn't correct? )

My opinion: Shouldn't be "hurts" more appropriate to use here? Or at least "He hurts himself while running" won't be wrong to use? It would mean that he always hurts himself whenever he runs.
I think it would be better to choose "hurts" here instead of "hurt"...

Q4 - He ______ to Paris tomorrow morning

a) goes

b) is going ( why this one isn't correct? )

c) went

d) will go ( correct )

Suppose two men are talking about a third person. If first person wants to tell second person that the third person is leaving for Paris tomorrow then won't he say him that, "He's going to Paris tomorrow morning"?

Thanks a lot :) Will greatly appreciate your help.