As per my view you should prepare for NIMCET exam once you are done with BCA from decent university or college and get decent score in MCA entrance i.e. NIMCET so that you can get admission in NITs as this would be the best choice and apart from this you can prepare for state level and private college entrances so please tell which particular state and college you are aiming for. Also, if you talk about the intergrated BCA+MCA then there are some private universities available like Chandigarh Universty, Utkal University which provide intergrated program for the same so again I would say please be specific with your interested state?