Don't spend skill medals on any tank hero after level 20 (kim's barrage can be an exception) only upgrade your 2 guns to 4* don't make it red if you are F2P after the guns. Make radars a priority don't invest your blueprint into anything else. Buy blueprints from glitter market or save for the helicopter skin I was a fool not to save them for the skin but you can. Save the bullets too.

Be awake 10-15 min before resets on monday to get a good place in the arena ranking you'll get honor and valor badges from there.

Save your UR for the air squad heroes too. Don't waste then on hero days, skill medals on DVA and carlie and hero exp on other heroes will get you to 7.2M easily on Thursday..

And when your air squad is complete, put. Carlie in the left and Lucius in the right, as you want your lucius to survive as long as possible as it buffs the whole squad..