Looking at your horoscope we see that you have Kemdruma dosha in the 9th house. The Kemdruma dosha is formed when there are no planets on either side of the Moon. This is not good and as this is being formed in the 9th house which is the bhagyastan. You will be unlucky. Work hard but lose things at the last minute. As you are in the mahadasha of Jupiter and antardasha of Sun, you can surely look at competitive exams. Jupiter in Gochar is retrograde and conjoined with Rahu. Therefore you will have to work very hard to get your results, however as Rahu is transiting Leo in the 11th house of gains, it can give most unexpected results.
You can always wear White Sapphire / Diamond and also Blue Sapphire.