This is a special mission which can reward up to 775 gold if the player completes this mission every day. That would require the player to win a total of 155 random battles.
So how to get the most of it?
Newbie player without a researched or premium tier V vehicle: If you still do not have a tier V vehicle, then you will not be able to claim the daily reward. The price of any tier V vehicle is higher than the total reward, which is equivalent to 310000 credits. The necessary time and credit spent to research any tier V vehicle will not be compensated by any amount of gold you could obtain. Thus your best option is to ignore the mission and focus on the improvement of your performance.
Any player with researched or premium tier V vehicles: Your best choice would be a vehicle you already have in the garage. You should choose a vehicle with the highest win rate and maximum experience per battle. This vehicle will increase your chances to win 5 random battles and be among the top 10 players by base experience earned. However you should avoid to use any premium ammunition or consumables. This will maximise the vehicle credit net income.
You can set the number of days to play in accordance with you are looking for:
1 day reward - Buy 10000 credits (25 gold)
2 days reward - Demount 5 pieces of equipment (50 gold)
4 days reward - Convert 2500 combat XP to free XP (100 gold)
8 days reward - Train 1 crew member in the tank academy (200 gold)
12 days reward - Acquire 16 barrack slots (300 gold)
15 days reward - Buy 3 permanent camouflage for tier V vehicles (375 gold)
20 days reward - Convert 12500 combat XP to free XP (500 gold)
24 days reward - Acquire 2 garage slots (600 gold)
30 days reward - Buy 1 premium T2 Light Tank (750 gold)
