Assuming you are Hindu and this is joint family property, even if the will turns out to be valid, you are entitled to apporach the nearest civil court and file a suit for your share. (Even if you are the female. HSA Amendment, 2005; daughters can be coparencers.)
If the property in question is your father's self-acquired property, you are not entitled to a share in such property and it's completely as per his discretion to dispose of such property. However, you can challenge such will on various grounds. If the will has been legally registered, a copy of it would have been maintained at the registrar's office within the jurisdiction of which the said property lies. If it hasn't been registered, it will be easier for you to challenge it.
I'd advise you to get in touch with a local advocate so he/she can assist you with the filing of the suit and through the proceedings that follow, more smoothly.