@Jan Muhammad There are several ways and statistical softwares to test the mediation model. To test one by one mediation relationship (e.g. IV1 > M > DV1 and so on...), you can use Process macro for SPSS (model 4). If you wish to test the entire model with both IVs, M, and three DVs, then go for AMOS, or Smart-PLS (GUI based softwares). Refer to some tutorial videos available on YouTube to learn how to run mediation model. Here is the link to one video for mediation analysis using AMOS👇🏼
Mediation analysis requires one to report that the IV predicts the mediator and the DV, ... (2) Then you run a hierarchical multiple regression analysis where the IV (and ... 1. Analyze > Correlate > Bivariate. 2. enter all ivs and DVs. 3. click option