(a) When a convict is sentenced on two or more convictions, unless specifically ordered in the judgment entry that such sentences shall run concurrently, such sentences shall be cumulative and such terms and imprisonments shall be served consecutively, the first term thereof beginning to run from the date such convict is received at the county jail or other place of confinement for the service of his sentences, the second and subsequent terms each beginning on the expiration of the preceding term. When it is specifically ordered in the judgment entry that sentences shall run concurrently, such sentences shall run from the date on which such convict is received at the county jail or other place of confinement for service of the sentence. However no person shall be sentenced to hard labor for the county so that the aggregate of the sentences on two or more convictions shall exceed for the crime two years and for costs 15 months.
(b) In case the prison record of a convict serving two or more sentences consecutively is good, he shall be discharged at the expiration of the last term of imprisonment to which he was sentenced less any deductions accorded him pursuant to Sections 14-9-1 through 14-9-3. In case the record of a prisoner during his term shall not have been good, the Board of Corrections, at its discretion, may revoke any or all of the deductions given under the above mentioned sections, and any amendments thereof, whether such convict is serving his terms of imprisonment concurrently or consecutively.