Colleges in Jaipur

As per their website, admission procedure starts in month of January followed by entrance test.

Consistent practice and preparation is the key to CAT preparations. Get yourself any class notes or author notes, and be regular and sincere with your time. Once your through with the basics, you would still have a long way to go. The most important stage in CAT is practicing and analyzing your mocks. Since your at home, join an online programme can help you boost your preparation and optimize your time. I can recommend you

In which course you wish to apply? Please specify.

No doubt, MNIT-Jaipur has a name and most of the students prefer to go for that, but Thapar Institute is also not a bad choice. CSE programme in comparatively has the best placement record till yet at Thapar Institute and the package is also quite good. So don't stress yourself much, you can go for Thapar Institute as it is also a reputed institution with well-equipped labs, faculty and infrastructure.

Yes, there is higher chance that you will get admission in JEE if 150+.
Good luck!