I am not sure if any of the above posters mentioned this, but you gotta try to to touch each section each day. Don't forget about the QR section. Did you watch Chads QR videos yet? Watch his QR videos if you have not done so already, then do Math Destroyer at least twice (tests 1-10 is adequate). The Math Destroyer is really really really a huge plus and I can't say how much. It prepped me so well for the real thing. I was able to tackle all sorts of questions.
In terms of reviewing, you have to try to cover all your notes for one section in one day. Then, the next day you have to move on to the next section and review it. For example, Monday-review all your Biology notes (look through them, review them, brush up on stuff you are weak in, etc). You have to do it all in one day. Then Tuesday-review all your GC notes (look through them, review them, brush up on weak stuff, re-watch videos that you need better explanation on, re-take quizzes if necessary, etc). Then Wednesday-do the same as above for OC, Thursday-do that for QR, etc. Try to read an article from scientific american or americanscientist.org everyday. Here is a link from Bootcamp's page on the bottom left that you should try to read every day. This will prepare you for the RC section since there isn't anything directly that can be done. Do a little PAT as well.
http://datbootcamp.com/classroom/reading-comprehension/
You mentioned that you have forgotten all your Chemistry material and that is understandable. Since you have been only studying biology for the past 2-3 weeks its going to happen. However, you gotta review stuff like I mentioned above. Do a certain subject and just focus on that for the whole day. Go over your notes, review them, re-watch videos and do quizzes again if you need to reinforce old concepts, etc.
You have to do DAT Destroyer for Biology, Gchem, and Ochem at least twice. First time might be hard, but second time it will definitely reinforce a lot of concepts. If you need to re-watch Chad's quizzes then definitely do that too.
For Biology, some people have said that Feralis and Cliffs can be hard or too dry because its just like reading a book. Everyone has their own way of studying, some are visual learners, some are able to comprehend things well from the books, some are audio learners, some are naturally smart, etc. If you are someone that is a visual learner, then definitely YouTube some stuff for a better understanding. Cliffs misses out on some physio stuff and that can do damage to your bio score, so use Google if you think its too dry reading a book the whole day. Here are some links that may help you as they really helped me in stuff I was very weak in. I think there were a couple questions that would've done damage to my bio score if I didn't know this stuff because the bio section is so random. Definitely try to just YouTube search this stuff or Google search this stuff for some videos (preferably YouTube). You will understand things better like this and try to take notes on how things work. Here are some links:
Lac Operon-
Immune Response-
Fertilization-
Ovulation-
Bozeman Science A&P playlist-
Physiology stuff-
http://www.innerbody.com/
Fetal Circulation-
http://cfaascience.files.wordpress.com/2010/11/fetal_circulation.jpg
Cleavage and Blastocyst formation-
http://www.vivo.colostate.edu/hbooks/pathphys/reprod/fert/cleavage.html
Spermatogenesis-
http://www.uwyo.edu/wjm/repro/spermat.htm
Operon (Trp and Lac) from Bozeman-
http://www.youtube.com/watch?v=10YWgqmAEsQ
Crash course (watch Biology & Ecology videos if you can't take notes and are driving)-
https://www.youtube.com/user/crashcourse/playlists
I listened to Crash course videos when I would be driving because I would sometimes have days where I would have to drive 3+ hours each day. It really helped kill time by just studying.
Craig savage protists-
https://www.youtube.com/watch?v=eBhSYTIcG1s
Craig savage animal diversity-
https://www.youtube.com/playlist?list=PLFED6FEA0027A542E
So your other question is what you should do now....well here's what I can suggest. Spend 4-5 days reviewing all your notes after you got everything down (do 1 subject each day). Like I mentioned above Monday-bio, Tuesday-chem, Wednesday-orgo, thursday-Math, Friday-re-do biology, Saturday-Gchem, Sunday-light review or chill. Then, if you have not started DAT Destroyer you have to do that. You gotta go through that at least twice because it will help you a lot. I can't tell you how random the bio section on the real DAT is and the destroyer is a great way to expose yourself to that. Organize/make or print a sheet/packet where you can write your answers for all your questions that you take on DAT Destroyer. Here's how I did it:
View attachment 186618
Do 40 Biology, 30 Gen Chem, 30 Ochem each day. First time you go through it, do it untimed. Mark any questions you got wrong with a slash (like you see above). By the way if you want this document, let me know and I'll send it to you. If you think there were some questions that you feel seem important or something you don't understand or that doesn't make sense or something you feel you should review more on for that subject or something you need to learn, then star it (like I did above in the second column). The first column is to write your answer and the second column is to put a star or mark it because you want to learn more about it or in case you skip it to come back to later. In the beginning, it was easy for me because I was fresh off reviewing my notes but towards the end of my biology destroyer questions, I was getting like 15-20 wrong. DAT Destroyer is meant to destroyer you, but its also meant to prep you well for the real thing, which is why its important to go through that thing twice. If you think your biology is weak then do Destroyer biology twice. Some do it only once because they have a solid bio foundation and they seem to know their bio stuff. Now, once you finish each section, you gotta go through all the questions/answers (regardless of if you got it right or wrong). Use your notes (everything you have and everything you used) to see how to get the right answer. If you have the question right then that's good because you know that stuff but try to answer it again while going through the questions and the solutions. For the questions you get wrong, flip back to whatever page your notes on that subject may be on and try to find the answer through there. This is how you will remember something because you are actively learning something and you are trying to learn more about it. If you still feel confused on stuff, then do what I suggested above. Google it, YouTube it, or try to research more on that certain thing. For example (I am making this question up), if one of the Destroyer bio question asks "Which of these is involved in cell-mediated immunity? a) B-cell, b) Cytotoxic T-cell, c) Red Blood cells d) Plasma cells e) Memory cells" and you chose the wrong answer, then YouTube or Google search cell-mediated immunity. There is a video above I posted on immune response that explains cell-mediated vs humoral immunity. It really helps answer this question. Take notes on the video(s) if you need to better understand a certain subject. Right down step by step if you need to because next time you are reviewing your notes you will be able to picture what exactly happened step by step in a certain thing. Do this stuff for Gchem and Ochem as well. Try to do it for Math Destroyer if you feel your Math is not so good. Remember: use your notes to find the answer for the wrong problems. If you can't find anything, then use the solutions at the back of Destroyer.
The second time you do DAT Destroyer time yourself. Give yourself 30 minutes Biology, 30 minutes Gchem, 30 minutes Ochem. Do them all together for 30 minutes each. Once you finish biology go straight to Gen chem and after those 30 minutes go straight to Ochem. THEN, once you are done grade your answers like you did the first time around and try to solve the answers. Use your notes to find the correct answer(s) to the wrong questions. Keep in mind this will take a long time to do (it took me 4-6 hours for Math Destroyer when I would do this), but if you are consistent then you will be able to finish it on time and in adequate time to do the other things that you have planned for the day.
Once you have gone through DAT destroyer twice, review your notes again. You might be approaching closer to your test date so you review your notes and then you jump to DAT Bootcamp. Take those bootcamp exams because those things are going to help big time. Be sure to review your notes everyday after Bootcamp each day. If you have some free days, review a certain subject that day. For example, say that you are kind of forgetting Ochem, then you can go through your organic chem notes for that day. You might know majority of that stuff, but you feel that you need to reinforce some of those weak spots so that's why you review it. Do bootcamp tests and right down important notes and try to solve for the right answer(s) again using your notes. Understand why something is right the way it is. Finally you test date may be coming closer so take those 2007 and 2009 tests as well. If you have some free time, then definitely re-review your notes. The day before your test, relax. Don't stress yourself by studying too much! Just do a light study and chill. You put in so many months of work so there is no doubt that you should do well!
Good luck!