Credit score

hey guys my name is Jeff my credit score is pretty low I have a few personal loan accounts that are open all in which are under $1,000 what's on my credit report is that's some of these are $60 some of these are around $300 and one or two of them are around $800. All of the accounts in question have been sent from the creditors to the collections agencies. But I have multiple loans that have the same credit collection agency. Question 1 would it be possible or even smart to see about consolidating them into one account for that certain collections agency or just leave them as multiple open accounts? Question 2 once it's been sold to the credit collection agency how do I see what the account originated from to make sure it was actually a debt of mine and not a mistake on my account? And last but not least when it comes time to pay these off what raises your credit score faster paying off the smaller ones all at once first or starting out with the bigger loan accounts and making payments