Alright, first off let me say this.  There is no easy way to do this.  This is just a basic guide but the tactics and strategies will have to be adjusted on the fly.  That also being said this is probably about the most foolproof way there is to get up to those annoying bunkers and should be a lot better than sitting backa nd getting sniped from the spawn. 

Secondary note: this requires at least 6 people.  There is no way else to do it if you have less. 

Point A:  This point is arguably the toughest point in all of sabotage to get.  It has great defenses all the way around it, a closed off section where SVER can sit and wait for you, as well as only three ways up, none of which are ideal.  The key though is to keep on the left side and make your offensive pushes from there.  Any progress you make will be on that left side.  Also as with any play in MAG use your medical kits. Keep reviving players and keep your team on their feet.

The first thing you want to do is make sure at least one person in your squad has nerve gas.  This is critical in attacking as you have to smoke out the people hiding at the top of the staircase.  Trying to throw grenades or anything else for that matter is useless due to the fact that they can cover fire better than any other team.  You have to force them from the position.

Now then right off the bat send your entire team up the left side and secure the closest bunker.  It may not be the best cover, but for now it will do.  Avoid getting yourselves killed and take out anyone foolish enough to charge you.  Now from here your team has to split.  Send at least two (maybe 3 or 4 depending on the size of the team defending the second bunker) to take the bunker that covers their flank while the second half of the team moves into position at the bottom of the staircases on the left side. 

While team 1 holds the bunker team 2 should gas the top of the stairs closest to the point.  From there team two can run up the opposite stairs to gain the high ground and infiltrate the point.  After they have the high ground it is all about how well they can clear out the enemy and how quickly they can get in position to defend from the counter attack.  Make sure when defending to guard the staircases with anything you can.  APMs are good, but even using gas on the side where the two staircases meet is alright.

Point B: Taking point B is easier than taking point A, though quite honestly not by a whole lot.  Like A it has two ways up and neither one is particularly good.  Right off the bat you are either going to have to coordinate with the other squad or split your team up into two.  Either way, you are going to have to coordinate your attack so that both squads can get up and in quickly. 

The first squad should take the far right path.  It's a tough road, but you have to fight your way through it.  Once again I recommend poison gas to get a foothold in the position as well as a lot of grenades to take out the enemies that are waiting for you.  Beware of grenades yourself though. 

Once that team has taken out the enemy on the far right bank squad two can move up.  They have to be quick though, and must hurry to the bottom of the tower.  From there the squad on the far bank can give cover fire (and in fact have a few guys giving cover fire anyways so that the enemy can't just mow you all down in one go). 

After team 2 gets in position team 1 has to cross the bridge and take out the enemy that is guarding the tower.  Continue to leapfrog as such when team 1 has taken the top have team 2 gas out the point before having both squads move in and attack the point.  After that hold as long as necessary.

Point C:  As it is rare for a game against SVER to get to point C the strategy I have made is not foolproof.  The only real thing I can tell you for certain is to not let them get into defensive positions because it will be difficult once they do get ready.  They will snipe you from the sky and they will kill you if you rush up the middle.  As such you have to use the flanks.  Keep to the outer edges of the map and if you have a silencer then use it.  Get behind their defenses and then the data center should fall.  Personally while not as hard as attacking Valor's C point it is still difficult.