I would absolutely not recommend doing this but you've already registered so here is my advice. First, identify any areas where you might not need to study. SInce you have worked in a engineering firm, maybe you don't need to look at grading calculations - just stuff like suggested slopes for specific uses or whatever.
Beyond that, there is a certain degree of overlap between the exams and you'll want to determine what that overlap is and really focus there. For example, ADA guidelines will be a great use of your time because they could appear on 3 out of the 4 exams, whereas fasteners would not be a great way to spend time as they are really only on one exam and even then they don't appear with great frequency on that specific exam. Any guidance you are going to get here will be somewhat biased because everyone gets a unique range of questions, so, again in the limited amount of time you have, focus on the areas of overlap and you can determine that by getting input here or by reviewing the CLARB LARE Orientation Guide.
The biggest key to your success will be in how you approach test taking strategy. Unfortunately the LARE does not do a great job of testing practice-based knowledge - in my mind its more of a test on if you did the required readings and are able to deal with the little tricks they include in the exam. You'll need to rely on process of elimination on multiple choice questions. By taking 5 potential answers and identifying the two most likely answers, you've gone from a 20% chance of getting that question right to a 50% chance. You're really going to need to play the math like this and then do little things like flag any question you aren't certain of what the answer is, go through the entire exam and see if there are contextual clues in other questions that can help better inform your decisions. You will also want to skip complex questions (like the grading ones) and leave those to last - not only because they use a different part of your brain than the multiple choice, but also because even though the question may take 3 minutes to answer, its worth the same amount toward passing as a question that took you five seconds.
Finally, CLARB has gone on record and said that multiple answer questions (choose all that apply) will never have only one correct answer and will never have all correct answers. This is the sort of stuff you are going to live and die by, not so much the actual content. Unless you are some sort of speed-reading genius (lol!) there is no way you can cover the material in the amount of time you have. Its literally probably 5,000 pages of reading and ranges from hyperspecific information (what does a specific admixture do to concrete, what is the height of an ADA-compliant handrail) to very general planning type information (what is the purpose of a zoning ordinance, transit-oriented development principles, etc) to ecological information (how is a bog different from a marsh, what uses should be located outside of aquifers). I truly applaud your ambition and hope you succeed, so be confident given that there is no going back and really focus on your test taking strategies.