I am G5 with a bad team.  Learn to fight the battles that you can win.  Look for 1 champ battles.  Avoid the battles that you know you may lose.  

Post your current roster here and the forum will help you to  build the best possible arena team.  

1 gold = 2 silver = 4 bronze

700 gold = 1400 silver = 2800  bronze

so you could get a gh bonus to 7 with just bronze or silver medals.

no you can't. you can use a higher medal to upgrade a stat, but not vice versa. so you can use any medals (including a combination of multiple types) on levels 1-3, only gold and silver medals from 4-6, and only gold medals for levels 7+.

to op, you're right that the mission order is illogical. progress missions in general and the arena missions in particular are wildly out of sync with the actual path of progress through the game. i wouldn't hold your breath about it getting fixed though.

So, that 4-25 mission used to be: Advance to Gold III tier and that got changed earlier this year. it also became retroactive upon making it to Gold 1. 

Some of the missions are a bit mixed up as well and don't make sense with the order.

e.g. in section 5 after all the hard missions you have done in level 4, with the unlocking level 10 in great hall, doing high levels in dungeons, doing massive damage on clan boss, etc.

You get a mission to unlock tag team areana. Which you unlock right at the beginning.

You get missions to use glyphs. Which you have probably used hundreds by this point.

You get missions to craft items in the forge. Again probably done hundreds of these.

Kind of boggles my mind that they "fixed" the Arena mission to make it easier while not touching the Great Hall one prior to it.  Talk about pointless. Seems like a half hearted effort to me, which is a shame. 

Anyway, thanks for the comments. I guess if I ever get past that point, I have a lot of easy missions to look forward to.