There is a similar "if you HAD to make $3000 in a month" thread in the money section you should check out. Here's my suggestions from that discussion (just multiply times three months for your case):
"If you have IM experience, then website flipping, webinars, JV and such may be your best shot. If you have not much of a background, freelancing jobs is your ticket---writing 20-25 articles a day for $4-5 will get you $100 a day, or $3000 over a month. It will require discipline to do so, plus a knack at placing enough ads or PMs to get that many assignments from people.
Other tasks you could do are account creation, depending on whether you have the time or automated software. Look at the marketplace area of this board, it's filled with people who mainly want lots of FB, YT, or other site accounts set-up for them.
WSOs are another option, if you are a quick study and want to read a number of ebooks on an IM topic, then write your own value-packed, but knock-off ebook with a snappy sales page on WF. Launch one a week priced at $37 or so, sell about 27-30 each, and you will earn about $1,000 per WSO, or $3000 from your 3 ebooks. Then sell them for $47 or higher off your website/blog, or on DP for the remaining life of the sales campaign."