You need to work on both buddy.
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You need to work a lot on basics before you again jump onto questions. Re-do all the basic revising give 2-3 hours to each sub-topic and focus more on where you do not understand a principle or a formula. There-after it is just raw practice wherein each practice session should be followed by an incisive analysis of which areas you are weak in.
Verbal
Sentence Correction (SC)
Preparation: Manhattan® SC 2007 edition, is an amazing book, one may call it the SC Bible as it prepares you exhaustively for SC.
Practice: Go through the GMAT® Official Guide (OG-12) for SC & understand the
concepts through Answer Key. Re-do all questions, if possible. Please pay
significant attention to idioms as questions on them are tricky but relatively easy.
Modifiers also require significant attention.
Aim: Achieve accuracy greater than 85% in all practice sets.
Important Tip: Don't spend equal time on all types of SC questions. Practice all of
them initially & identify your weak areas. Focus your efforts more on these for
more robust & efficient preparation.
Reading Comprehension (RC)
Practice: Practice from all possible sources as a lot of raw practice is required to
ace RCs. Practice at least 100 RCs before you attempt a mock now.
Aim: Read easier passage in 2-3 minutes & understand the basic gist of it. If the
passage is really tough you can take up to 4 minutes. Do not rest until you
achieve accuracy > 85 % in all practice sets.
Important Tip: We also advice against jumping to questions first & then looking
for answers in the paragraph. Reading essay first makes answering "main point"
& "summary of essay" questions seem like a cakewalk.
Critical Reasoning (CR)
Preparation: Critical reasoning Bible by PowerScore®, helps with all CR basics, and the CR basics are very crucial to cover before you start attempting questions.
Practice: All GMAT® Official Guide (OG-12) questions alongside reading the Bible.
Aim: Achieve accuracy greater than 85% in all practice sets.
Best of luck!!