OKAY ILL TRY THAT! thanks any more tips to add to this?
Sure. Most of the European Hall events are easy pickings; buy a new Golf V GTi, give it an oil change and a rear spoiler, buy the racing muffler and computer (don't buy a turbo or it'll have crazy wheelspin) plus clutch/flywheel/weight reduction 1, turn off all assists and increase downforce to 30 / 30, and it should easily take care of the Hot Hatch and Liga A events. If you know how to tune suspension, buy the custom suspension, soften the damper bounds and give the rear wheels some toe-out.
You'll get an M3 GTR race car which you can use in the BMW manufacturer event, then you'll get a regular M3 GTR which you can use in Liga B, then you'll get an AMG DTM race car which you can use in both the Mercedes manufacturer event and the DTM event...you see where I'm going with this. There's a lot of chains where you win a prize car that can be used in other events.
So yeah, it's mostly a matter of being efficient. If you know how to chain one event into another and use prize cars to your advantage, the game flows really well and you should never need to grind for credits. Even in cases where there's no prize car that can do the job, there's usually something in the used lot. I picked up a Griffith 500 to deal with the TVR manufacturer race, and it was eligible for British Lightweight Car Race after weight reduction stage 1 also, which gave me a Lotus Europa that I could use in multiple events.
Other than that, just basic stuff really; the rear spoiler is a fantastic upgrade for adding downforce, always give cars an oil change for a power boost, always turn off ASM.
Also, for the snow races, you can use the RSC for that as well, but I wouldn't really recommend it. Its wide body makes it very awkward to overtake on Ice Arena. I suggest using a smaller car, like the RS200 or CZ-3 Tarmac.