Ok so I'm totally not going into the mechanics of the squat or addressing your squat problems with this. I wrote a multi-parter for that. I'm going to assume you feel comfortable with your squat technique and just want to know how to setup a squat cycle to get ready for a meet.
Realistic Goals -
This is going to be the dead horse that I constantly beat. You have to set a realistic goal to hit at the meet, and you have to know what kind of time frame you will need to plan for to hit that goal. If your goal is 50 pounds on your current squat and you are currently near peak strength, then set aside a realistic time frame to do that in. That could be more than a year. Who knows? You know your body, how long you have been training, and how well you respond to certain stimulus.
So I am going to use a fairly novice guy with a 300 squat for example and set him up a cycle for hitting 320 raw.
The first thing I'm going to do is use the 93% training rule. Base the training max on 93% of what the real max or what you want to hit at the meet. This keeps the cycle conservative so that you don't burn out too early, but move enough weight to get stronger, especially towards the end of the cycle where you want to be peaking in strength.
320 * 93% = 300 rounded down
300 = 100% of the training max
300 is also the weight we need to triple in order to be prepared for that 320 single. The lifters current max.
Week 1 - 80% x 1, 70%x2x5, Pause Squats - 60% 2x5
Week 2 - 85% x 1, 75%x2x5, Pause Squats - 65% 2x5
Week 3 - 90% x 1, 80%x2x5, Pause Squats - 70% 2x5
Week 4 - 93% x 1, 85%x2x3, Pause Squats - 75% 2x5
Week 5 - 95% x 1, 85%x2x5, Pause Squats - 75% 2x5
Week 6 - 98% x 1, 90%x2x3, Pause Squats - 80% 2x3
Week 7 - 100% x 3
Week 8 - Deload - 70% x 5
Week 9 - Meet, 100% x 1, 110% x 1 - third attempt go nuts
This puts our meet lifter hitting 300 on his first attempt and roughly 320 on his second.
This is one way you can set up a peaking cycle. If you wanted to run it out longer, you could find more splits in the percentages like adding a week of 83% and 88%. That would make it a 11 week cycle total. You could also reduce some weeks and run 6, if you had already come off a meet or were already close to peak strength. Just start at the meet and work your way back 6 weeks. Some guys take a week off after a meet, and some guys go right back at it. All up to you.
Don't peak too early. This is where you hit PR's in the gym several weeks out before the meet. No way you will hold it for that long. In my opinion there is about a week gap on each side of the meet that you have where you are going to have a good shot at your goal. So move easy weights the first few weeks, and don't miss anything in training. If you are looking at weights you've never hit before by the time week 5 rolls around, you planned too high on your cycle.
Assistance work -
To me, pause squats beat everything else hands down for squat assistance work. If you want to throw in some leg press or lunges after that, just be mindful of how it effects your squatting. In other words, if your leg press is going up but your squat isn't moving, then you are leg pressing for nothing. Remember the key is to find movements that will help the main lift. That's what REAL weak point training is. And at various times, various lifts are going to help the main lift. So stick with 1 main movement after the big lift that you intend to really get after. If after three weeks you haven't seen anything good happen, switch it out for something else. If you don't want to do any assistance work, that's cool. The squat is the one lift that most people agree moves itself just fine.
The pause squats should be explosive and fast for a few weeks. Make sure you concentrate on staying tight in the hole and exploding out. These should not be grinders. They should get difficult in the last few weeks.