premium crate drop rates?

I am new to pubg but was wondering regarding the premium and other crates what the trend is e.g

are the skins 1 time only or do they sometimes come back?
are there any other ways to get the skins? (mainly want the car skin)
is there any trends (like it's 60UC for 10 pulls but before the event ends they tend to hold special offers? )
what's the best way to get mythic skins? Is it just from these crates?
does saving for a 10 pull have a better drop rate?

Solution

Hello! Welcome to PUBG MOBILE. Here are some answers to your question, hope this helps:

Some items will be available for only once, but they might come back in the future too. So there is no certain answer to this question.
Other than opening crates or spins, you can sometimes complete missions from Royale Pass (vehicle finish is usually available as RP prizes and can purchase no where else) or Game events to obtain new items, you can also purchase it through the shop.
There is no special offers or trends for crates, it will be the same till the end then refresh for next crate. But there will be a daily first draw for spins for only 10 UC and first weekly draw for Mythic Forge for 5 UC.
Currently the best ways to obtain Mythic outfit or finish are from Royale Pass (100% guaranteed to obtain Mythic items if you complete missions from RP), and Mythic Forge (Higher chance to obtain Mythic items then most of the spins and crates).
Draw once or ten times at once does not affect the drop rates. You can find out the drop rates of different quality items by clicking on the
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