How to rank up fast in battle feild bad company 2

I know battle field bad company 2 is old but its new to me so i noticed the best way to rank up fast is to be a medic. Medics are awesome lol i love medics and you should too. But i also noticed that if you are an engineer you should unlock anti tank mines and spam anti tank mines everywhere. Make sure that you equip the grenade upgrade before you start your spam assault, you'll get like 7 mines and create a mini d-day. One mine will usually kill a tank and 9 times out of ten there will be two people in a tank so you'll pick up multi-kills. You'll get a shit load of points and they will cascade and you'll get a lot of pins and such. Just be aggressive too, this inst call of duty so don't worry about your k/d ratio, just go balls out like i do and you'll pick up a lot of pins and weapon medals. Another dirty way to rank up fast is to use the assault class and pick a weapon in which it allows you to use C4 and just stamp them on an ATV and crash it into the mcom and blow it up. Then after you blow it up just drop an ammo box and pray no one kills you. This requires a little skill to pull this off successfully lol so good luck. Its dirty but it works but you're gay for trying it but it works nonetheless. But yeah i cant wait for battlefield 3 to be released because i will mine the hell out of the jet runways. Get my troll on and such