Is my credit improving

Hi everyone , my credit file rating has dropped and raisn into poor frrom very poor , its been dropping for maybe 6 months out of 8 in total where 2 of those in the middle it jumped 70 points the dropped all those plus another 46.

Now i know you you credit score means nothing on the grand scheme's of things but it feels good to see it improving then take a drop , i see nothing on my files from a few sources that haven't been for the last 5 plus year when i got my act together.

Anyway long story short , 2 years ago i got a car loan it was a bad credit finance but at the time i couldn't of got 1p chew on credit as i had 6 bad credit where no i have 2 to expire within this next year so quite old.

Fast forward febuary 2018 , i decided to try for a credit card as when i change my car i want a better rate as payment have been good and on time. Anyway i applied for an opus credit card and to my surprise i got £300 now a friend that had applied and a better rating than me had for £600 to start. Fast foward until today i'd had my 4th rise and from £300 too £3500 (my friend only has 1 upgrade to £900 so fa)r .I've also got a mobile phone on a monthly plan which i could never get a monthly sim on its own . I've also got 2 small account cards from vanquis and captial one that i may spend and payback when bill come is about £20 each per month.

Any everything is being paid on time and i use the opus alot maybe £3-500 a month as i would use it and keep my money in the bank and pay the full balance 1 day after the statement .

So why does your score jump around so much when your doing better than you ever done in your life and actually take care and pride on your finances now and only thinking in the fututre for maybe a morgage and a nicer car .

Sorry about the long post but its confusing for me to be doing great and everything a green tick yet these credit agenties mess around with the scores.