Hmm... Tough one! You say you don't have enough time for the SC guide, but unfortunately I can't think of a better book that covers the topic of GMAT-specific grammar (maybe the PowerScore SC Bible?). My advice is to go for the Resources page and check out the links there - Spidey's Notes and the like. I see you've been practicing, but if there's no background to all the practice, then you're going nowhere. You need to have a solid concept basis before anything else!
While it's really good that you've been targeting your weakness, you should not neglect your strengths either. Since your quant level is not top tier (i.e. 49-50-51), as you've said, you should pay due attention to this section as well. Even though you feel that DS is your problem in quant, notice that the hit rates are comparable (60% for PS and 58% for DS), which might be a sign that you should not completely ignore PS either.
Rescheduling your exam is always an option. I personally do not know if you can do that much in 15 days, but I've heard of people actually cramming their whole prep in two weeks, so... I guess it depends on what type of learner you are. But IMHO, your main issue is not studying, but rather attitude/mindset. There's no reason for you to be so negative! I find that the best option for me when taking tests is to be optimistically realistic, if I may say so. Getting in a good vibe will also help you, since it relaxes you and you perform much better.
Good luck!
While it's really good that you've been targeting your weakness, you should not neglect your strengths either. Since your quant level is not top tier (i.e. 49-50-51), as you've said, you should pay due attention to this section as well. Even though you feel that DS is your problem in quant, notice that the hit rates are comparable (60% for PS and 58% for DS), which might be a sign that you should not completely ignore PS either.
Rescheduling your exam is always an option. I personally do not know if you can do that much in 15 days, but I've heard of people actually cramming their whole prep in two weeks, so... I guess it depends on what type of learner you are. But IMHO, your main issue is not studying, but rather attitude/mindset. There's no reason for you to be so negative! I find that the best option for me when taking tests is to be optimistically realistic, if I may say so. Getting in a good vibe will also help you, since it relaxes you and you perform much better.
Good luck!
















