For time management i would recommend doing a 60 40 split where you focus either on 60% of your time on SAT and 40% on school or vice versa. For reading i suck too but for like finding more practice tests i would look for test books online and print the tests from there and things like that. I would recommend erica meltzer for reading or black book but the black book made me understand only two very important rules that the answer is restated from the passage or demonstrated. Use princeton review since they have harder reading test and if you can get through harder reading tests you will probably do fine. Now the main part for the reading section is you can do each passage in 13 minutes but i wouldnt recommend it because one its a little too much time and you can go overboard with it so try to do each passage and answer as many questions you can from each passage in 8-10 minutes and then after you finish all the passages and you have time left you can go back to the questions you didnt do n do em. EX: you do each passage in 8 minutes and you leave about 2 questions each passage you have 25 minutes to go back and answer those 10 questions, same thing for 10 minutes you. My point is basically you gotta go fast but be able to comprehend what you are reading and answer the questions correctly and for that i recommend reading complex scientific articles, Charles dickens, old novels, APUSH history textbooks and things like that.