A thought from a night owl

good day to everyone, this morning something my little peanut of a brain had to try to wrap itself around this morning was; personally contemplating heaven and hell as I stay up later and later ruining my social/general life, and I thought hard filtering thru all the measly information that I know as fact and understand as fundament to get to a few questions: 

whose to say your whole soul would go to heaven or hell?

what if only a portion was sent to heaven?

and hell a cyclical reincarnation?

do souls combine in reincarnation?

is that why we supposedly have no memory of past lives?

i could see how being damned to live on earth would be a formidable test and the portions of you that fail are cast back down the ladder to be resculpted into that of which is worthy of salvation. 

But a lot of my ends dangle loosely and I’ve always lacked clarity.

let me know your thoughts!