I am now at chapter 3 in SOA and my PC being level 13 and here what my party look like tell me what I should change to get the best romance/powered and sub-quest party...

-Male PC Level 13 Monk
-Jhaira lvl 10figther/10 druid
-Keldorn lvl 11
-Valygar lvl 10 soon 11
-Yoshimo lvl 13
-Kelsey lvl 13 i think

so what should i change in that

O and i was wondering if i get another NPC now will he be same lvl as my PC?

That party looks fine for now. I would plan on eventually swapping in Imoen for Yoshimo. Imoen has a fairly cute romance with Kelsey, you really don't need that much in the way of thief skills (Imoen can handle being your only thief), and a second mage is never a bad thing.

The level of an NPC that you recruit matches yours at lower levels but the recruitment level for the NPCs is capped so if you wait too late then the NPC will be at a lower level than you. I think that you are already at the cap level so I would make any changes or get around to rescuing Imoen sooner rather than later.

the npc lvl's are capped at ~12 i think

It looks like a good little party. You should definitely add Imoen to the group. Do not worry for which one you should kick out, things will be settled themselves if you continue with this party. :p

I hear that, add little Immy in later, but i don't really like Valygar. Whether it's because you could use a cleric or another magic user (Imoen when you get her) or simply because I just don't like him! But if you like him that's fine, I'm just saying I don't think he's really that strong for a Stalker. I can see your party is a heroic one, but I'm kinda betting you don't wana add Anomen in ( :D ), cause i mean, who would!

But yeah, you've got a good party lined up there Jaws! Should become really powerful later on!

You could maybe do with another cleric/priest, but apart from that it's fine.

You're really going to miss a cleric. Avoiding spoilers: you will face opponents that love to Level Drain you and Jaheira, being a druid, can't cast Restoration.

Turning Undead is anothering handy skill that Jaheira lacks and there's a few other cleric-only spells that could really come in handy.

I'd drop Valygar in favor of Aerie, Anomen or Viconia. Viconia and Jaheira will fight over your character quite a bit, which can get real amusing, though eventually Keldorn will give Viconia the smack-down. Aerie is quite powerful but whiny. Just don't do her romance and she's quite tolerable.

Thank so i guess from your suggestion i should just get imoen and drop yoshimo and get a cleric (maby anomen)well thank for evrything guys if you have more to say fell free

You've got to wait on Imoen, so no hurry there (keep Yoshimo for now as he's the only single class thief NPC in the game). As for Anomen, you may want to add him after completing the sphere (if you haven't already) so that you can drop Valygar with some kind of role playing credibility (if you care). Anomen winds up as a very credible tank and progresses as a single class cleric, leading to fun undead chunking pretty quickly.