I usually take 4 min on 8 sentence completions and still get 1-3 wrong. This ends up messing me towards the end of the reading when I have a few minutes to answer lots of questions. How do I improve my sentence completion tactics and pacing. I haven’t done much vocabulary prep (going to start soon) but I feel like I end up reading a sentence 4-5 times (especially the dual blanks) and that really messes me up. Sentence completions are my weakness as of now since I usually get more wrong on those than I do on the reading which I get 0-3 wrong on 
Please help and thank you! BTW I’m using The Essential Guide for SAT Critical Reading by Larry Krieger and I have the Direct Hits Vol. 1+2 (although I haven’t touched it).