This is a very difficult question. Unless you are willing to step out all the way from the organization, face a disciplinary committee (or not), then be honest with the students and tell them how you feel. If you don't want to do that just tell them that due to personal issues you won't be able to continue giving them Bible studies and ask them what do they want to do. You may also ask how do they feel about what they have learned so far and to be honest with you, maybe they have questions they are afraid to ask, or things they disagree with and you may tell them to be thourough in their studies and not make a decision they are not sure about.
I understand you feel like a hypocrite by telling them things you personally don't care about or believe in, and that is certainly not a good feeling. But remember that there will be consequences to your decision and only you know how you will handle the outcome. Do you have family members in the organization? How long have you been baptized? If you have outside support like friends and family and you are the only one in the organization, then by all means do what you feel it's right. But if all your family and friends are JW's then you be prepared for the stress and the deprogramming, it is not easy.