1.It is strange that the college authority has stopped EL. Have they introduced any other leave in place of EL? hat is that leave called? As per Act, any employer is bound to allow EL and medical leave and based on the rule you are eligible to get EL,
2.You have given half backed information. Have you applied for EL giving the authority sufficient time to arrange for an alternative for you? In any case they were supposed to inform you in case your application was rejected,
3. After quitting the college, you can certainly ask for your dues which includes gratuity to be pid to you,
4.It depends on your terms of employment mentioned in your appointment letter or service conduct rule. If there is any provision to adjust the notice period with unused EL, then you can take EL. Alternatively you can first take EL for the notice period then resign giving notice for the said period,