To score well in the different sections in the PTE Test understand the techniques of different questions.
For instance, in the speaking test, work on your pronunciation to remove the Indianism. Likewise, in the reading test, practice collocations to score more in fill in the blanks.
Moreover, if you practice well in the speaking test it will increase your fluency, pronunciation and modulation which will be conducive to score well in the speaking test and not only that, the marks from this section will also get added in the reading as well as listening tests thereby escalating your score in each as well as the overall score.
In the writing test, use connectors and a good range of vocabulary. Similarly, in the listening test, make notes.