635 is an amazing score in Neet. With this marks you can expect many colleges under all India quota. Among those, some top government Medical colleges of India you can get are- Andhra Medical College, Guwahati Medical college, Nalanda Medical College, Vardhaman Institute of Medical Sciences, Darbhanga medical College , Indira Gandhi Institute of Medical Sciences Patna, Goa Medical College, Government Medical Collegw Baroda, Government Medical College Surat, BPS Govt Medical College, Kalpana Chawla Medical College, Rajendra Institute of Medical Sciences, MGM Medical College, Mysore Medical College, GMC Ernakulam, Lokmanya Tilak Municipal General Hospital and Medical college, Rajiv Gandhi Medical College Kalwa, SCB Medical College Cuttack, GMC Amritsar, Sardar Patel Medical college, Jawaharlal Nehru Medical College Ajmer, GMC Vellore, Gandhi Medical Collegw Secundrabad, Osmania Medical College, Motilal Nehru Medical College, Dr Ram Manohar Lohia Institute of Medical Sciences, Lala Lajpat Rai Memorial Medical College, Indira Gandhi Govt Medical college, Calcutta National Medical College, IPGMER Kolkata, Nilratan Sircar Medical College, RG Kar Medical College Kolkata and many more colleges are achievable with this rank. You can check this link for cutoffs of all India quota http://medicine.careers360.com/articles/neet-cut-off-for-government-colleges But keep in mind this is based on previous year cutoffs and this year it might change. I would suggest you to use Neet College Predictor tool to know where you have good chances http://medicine.careers360.com/neet-college-predictor?icn=QnA&ici=qna_answer