1. A computer system for efficiently predicting software testing schedule of one or more applications, the computer system comprising a programmed microprocessor, the computer system further comprising: a user interface configured to: facilitate, using the programmed microprocessor, creating a base execution plan for software testing of an application; and receive, using the programmed microprocessor, values of one or more factors affecting test execution; a test management tool interface configured to receive, using the programmed microprocessor, data related to test execution from one or more test management tools; a schedule prediction module configured to: analyze, using the programmed microprocessor, the received values of one or more factors affecting test execution and further configured to modify the created base execution plan based on the received data related to test execution and the analyzed values of the one or more factors affecting test execution to generate one or more modified execution schedules; and simulate, using the programmed microprocessor, one or more scenarios to determine impact on cost and resources required for executing the software testing of the one or more applications; and a stability module configured to determine, using the programmed microprocessor, stability of the application at one or more stages of the testing of the application by generating a system stability score, wherein the system stability score is generated based on values of one or more stability and risk factors associated with the application; wherein the values of the one or more stability and risk factors are determined using the data related to the test execution received from the one or more connected test management tools.