Is 3 months to get 630 ?

HI guys,
Some of you may have read some of my previous posts.. and I am gonna be completely honest with you guys about my progress and scores :

Here is just quick summary of my study line :

Mid- October 2009: I took my first CAT diagnostic test on the Knewton Website and scored ( Q11; V26)- 390
I remember spending 20 min on one single question and guessing all the other questions.

Start of January 2010 : I took a Manhattan CAT test and scored (Q13; 27)-390 did not understand the questions fast enough and had to read few times.. also poor time management

End of January I took two more CAT tests :

A) Manhattan CAT and scored ( Q21, V 28)-430 . still poor time management as I had to guess the last 8- 10 questions in the QUANT part but felt like I was improving.
B) Official GMAT test.. you're not gonna believe this but I got my lowest score (Q9;V16)-270 , I did not finish the test on time.. and had difficulty in understanding the questions and had to guess the last 10- 12 questions in the Quant Section. My verbal score also dropped dramatically.. and was quite surprised..

I don't understand why my score has actually decreased from 430 to 270..

I am now considering rescheduling my GMAT appointment either for the end of April or maybe June( although that might a bit late for some B-schools.. need to check with them ).

I have looked at the study plan you guys mentioned and but there's so many out there.. and also so many different resources..

To be completely honest with you I'm more confident with the Verbal part even if my last score was very poor.. regarding maths I have difficulty to sink in Sequences, Weighted-Averages and especially Problem- solving .. I think one of my greatest weakness. is strategy and understanding of the question.. by the time I understand or have an idea of the question ... 1 minute is already gone.. ! Also how I don't know how to structure my answers and reword the questions..

Any suggestions :

I mean I have on average 2-3 hours a day totalling 180- 270 in 3 months.. maybe I need some more time.. I might take the test in June test.. also you think it's woth to split up the work e.g. 1 month doing only maths and 1 month doing only verbal or do you recommend doing some of each every other day.. ? Also I have another assessment on the 1st of April..

Here's a possible idea , tell me what you think :

( Feb- April : 3 months) Focus on Maths only and understanding key concepts.. slowly but efficiently.
( April: 1 Month) Focus.. on Verbal but still do some maths every other day
( May) Pracice CAT tests
(June) Take the exam in mid June, two weeks to review mistakes.

I don't knwo if it's a good.. plan.. I would have to select the right materials.. also.

Any help with planning will be much appreciated,
Mass.x