BLOCK 2 CONSOLIDATION THERAPY: (weeks 9-11) Patients receive high-dose methotrexate IV continuously over 24 hours on day 1; leucovorin calcium PO or IV every 6 hours for 3 doses on days 2-3; methotrexate, hydrocortisone, and cytarabine IT on day 1; cytarabine IV over 3 hours every 12 hours for 4 doses on days 2 and 3; and dasatinib PO on days 1-14 OR on days 1-21. Patients also receive G-CSF SC or IV QD beginning on day 4 and continuing until blood counts recover. After completion of block 2 consolidation therapy and recovery of blood counts, patients undergo bone marrow aspiration for evaluation of disease. Patients with MRD < 0.01% (standard-risk disease) with a matched related donor and who are willing to undergo hematopoietic stem cell transplantation (HSCT) proceed to HSCT off study. Standard-risk patients without a suitable donor or those who elect not to undergo HSCT proceed to post-consolidation therapy. Patients with MRD >= 0.01% (high-risk disease) with a matched related or unrelated donor proceed to HSCT off study. High-risk patients without a suitable donor proceed to post-consolidation therapy.