Documents needed for an abroad student in France

[Dudzii]

Well Hello everyone !

Here's my deal. I have a bad history with U.K. Visa applications they refuse them for the silliest reasons so I gave up on it. ( it was a student visa I was applying for at the time)

I am now a student in France and my boyfriends family are inviting me for a week summer holiday in U.K.

Now I've already gotten the invitation letter and the deed be agreement, bank staments and copy of their passport. But now I'm wondering what documents I need to give in for the application to go as smooth as possible. Everything is already paid for (tickets,about to pay for visa appointment) and I will be living with them for that week.
So basically I won't be spending much.
How much money do I need in my bank account ?
If I don't have enough money in my account, can I let my mom sponsor me ? If so what documents will I need for that ?
And last but not least, what is the ultimate checklist of documents to guarantee me the visa? (It's going to be really embarrassing then going through all the trouble and I end up not being able to go cuz my visa is rejected )

Please help !!!!

[CR001]

What is your question? You have posted randomly in a work visa sub forum and provided no information on your immigration history or nationality.

[Dudzii]

Premature post, updated it to information needed. And I am Sudanese

[CR001]

How many UK visa and what visas have you applied for and been refused?

What are the 'silliest reasons' that they have been refused?

[Dudzii]

I've been refused 3 student visas on the course of 3 years. First time was because of insufficient funds (understandable) as I was unaware of the amount of funds needed for living.
The second time was because there was no movements in the account ( it was my college savings account so we didn't use the money from that account) and the third time was because my IELTS was expired 2 weeks after I gave in my application that's when I decided I should probably just give up and try to get my education elsewhere (I was going to appeal but my uni had to withdraw the CAS so it would've been pointless)

[CR001]

How recent was the last visa refusal for the UK?

How long do you plan on visiting the UK?

Expect a visit visa application to be heavily scrutinised and possibly refused.

[Dudzii]

The last visa refusal was in October 2016.
That's what I thought but what documents do I need to give in for me to be on the safe side ?
I'm planning to stay for one week as stated in previous post. Tickets are already booked and I will be staying at their house.
Other than an invitation,deed agreement, bank statement and photocopy of passport from their side, what else do i need ?
And how much funds do I need ?