Here's my guide to Simgirls VN2, reposted from Newgrounds. I maxed Tomoko's stats on Day 15. I focus on increasing her stats first (Career, Body, Accessories, Beauty - in this order), keeping her mood just high enough to do what I want, until Day 16.
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It's important to know that there is no upper limit to Tomoko's MOOD, and no upper limit to her AP during the day. If you get more mini games than I did, you might finish earlier.

Day 2-4
I work on Tomoko's Breasts (since they take AP, but does not affect her MOOD), reaching Grade D on Day 3. I max Tomoko's Breasts on Day 4, and start working on Tomoko's Legs.

Day 5
I almost max Tomoko's Legs, reaching Grade C. Tomoko can start dating on Day 6. To keep her MOOD up, I take Tomoko to the Bathroom for -10 AP each time, increasing the chance of triggering a Mini-Game for an easy 20k, which I use to buy AP.

Day 6-11
I take Tomoko's CAREER dates to the Lagoon, Classroom, Gym, and SimTower Office, and max her CAREER stats (Luck, Intel, Talent, and Fame). I reach Grade A, with a score of 5026.

Day 12
I have Tomoko date Junta exclusively from now on.

Day 12-14
I start on Tomoko's Face, maxing it on Day 14. I finish Tomoko's Legs, and reach Grade AA, with a score of 6055.

Day 15
I start Enjo-Kosai, which pays 30,275¥ at this point. I keep Tomoko's AP and MOOD to at least 60 each, so I can finish Tomoko's BODY (Hips and Curves) while still earning money. I reach AAA with a score of 7035. Then I start accepting ALL STATS jobs (which pays 21,115¥ at this point), and Tomoko takes her first dip into Venus Lagoon (with Junta).

Now I work on and max Tomoko's Skin, since it takes only 30 AP and 2,000¥, and only goes up to 500. Tomoko is earning 40,125¥ from each Enjo-Kosai, and 24,075¥ from ALL STATS jobs. I keep Tomoko's MOOD and AP to a minimum of 180 each, so I can keep earning money while buying ACCESSORIES.

Before I finish buying ACCESSORIES from Grand Gorgeous 21, Tomoko shoots up to SSS, with a score of 10,025. I finish the rest of Tomoko's stats, take a trip up to the Penthouse to get the last card, and finally end Day 15 with a score of 12,494.

Day 16 - 30
Don't need to grind anymore. So Tomoko takes Junta to Venus Lagoon twice a day and does Enjo-Kosai once a day (which now pays 62,470¥). I had Tomoko dating Junta exclusively after filling CAREER stats, so her RELATIONSHIP with him (19,250) is easily high enough to beat her competition.